Tragedy of the commons

Self-interests causing depletion of a shared resource

Industrial pollution is one of the consequences of operators ignoring their effect on the shared environment. Part of a series on

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The tragedy of the commons is a metaphoric label for a concept that is widely discussed, and criticised, in economics, ecology and other sciences. According to the concept, should many people enjoy unfettered access to a finite, valuable resource such as a pasture, they will tend to overuse it and may end up destroying its value altogether. Even if some users exercised voluntary restraint, the other users would merely supplant them, the predictable result a tragedy for all.

The metaphor is the title of a 1968 essay by ecologist Garrett Hardin. As another example, he cited a watercourse which all are free to pollute. The concept itself did not originate with Hardin, but rather extends back to classical antiquity, being discussed by Aristotle.

The principal concern of Hardin's essay was overpopulation of the planet. To prevent the inevitable tragedy (he argued) it was necessary to reject the principle (supposedly enshrined in the Universal Declaration of Human Rights) according to which every family has a right to choose the number of its offspring, and to replace it by "mutual coercion, mutually agreed upon".

Some scholars have argued that over-exploitation of the common resource is by no means inevitable, since the individuals concerned may be able to achieve mutual restraint by consensus. Others have contended that the metaphor is inapposite because its exemplar – unfettered access to common land – did not exist historically, the right to exploit common land being controlled by law. The work of Elinor Ostrom, who received the Nobel Prize in Economics is seen by some economists as having refuted Hardin's claims.[1] Hardin's views on over-population, along with those of writers like Paul R. Ehrlich have been criticised as simplistic.[2]

Other criticisms have focused on Hardin's racist and eugenicist views, claiming that his arguments are directed towards forcible population control, particularly for people of colour.[3][4]

## Expositions[edit]

Cows on Selsley Common, UK. Lloyd used shared grazing of common land as an illustration of where abuse of rights could occur.

### Classical[edit]

The concept of unrestricted-access resources becoming spent, where personal use does not incur personal expense, has been discussed for millennia. Aristotle wrote that "That which is common to the greatest number gets the least amount of care. Men pay most attention to what is their own: they care less for what is common."[5]

### Lloyd's pamphlet[edit]

In 1833, the English economist William Forster Lloyd published a pamphlet which included a hypothetical example of over-use of a common resource.[6] This was the situation of cattle herders sharing a common parcel of land on which they were each entitled to let their cows graze.

He postulated that if a herder put more than his allotted number of cattle on the common, overgrazing could result. For each additional animal, a herder could receive additional benefits, while the whole group shared the resulting damage to the commons.[7] If all herders made this individually rational economic decision, the common could be depleted or even destroyed, to the detriment of all.[8]

Lloyd's pamphlet was written after the enclosure movement had eliminated the open field system of common property. Dahlman and others have shown that his description was historically inaccurate, pointing to the fact that the system endured for hundreds of years without producing the disastrous effects claimed by Lloyd [1] (For the real position in Lloyd's time see below, Criticisms.)

### Garrett Hardin's article[edit]

The Tragedy of the Commons

Presented| 13 December 1968
Location| Science
Author(s)| Garrett Hardin
Media type| Article

In 1968, ecologist Garrett Hardin explored this social dilemma in his article "The Tragedy of the Commons", published in the journal Science.[9] The essay derived its title from the pamphlet by Lloyd, which he cites, on the over-grazing of common land:[10]

> Therein is the tragedy. Each man is locked into a system that compels him to increase his herd without limit - in a world that is limited. Ruin is the destination toward which all men rush, each pursuing his own best interest in a society that believes in the freedom of the commons. Freedom in a commons brings ruin to all.

> — Garrett Hardin, The Tragedy of the Commons

Hardin discussed problems that cannot be solved by technical means, as distinct from those with solutions that require "a change only in the techniques of the natural sciences,[11] demanding little or nothing in the way of change in human values or ideas of morality". Hardin focused on human population growth, the use of the Earth's natural resources, and the welfare state.[12]

Hardin argued that if individuals relied on themselves alone, and not on the relationship between society and man, then people will treat other people as resources, which would lead to the world population growing and for the process to continue.[13] Parents breeding excessively would leave fewer descendants because they would be unable to provide for each child adequately. Such negative feedback is found in the animal kingdom.[12] Hardin said that if the children of improvident parents starved to death, if overbreeding was its own punishment, then there would be no public interest in controlling the breeding of families.[12]

#### Political inferences[edit]

Hardin blamed the welfare state for allowing the tragedy of the commons; where the state provides for children and supports over breeding as a fundamental human right, a Malthusian catastrophe is inevitable. Consequently, in his article, Hardin lamented the following proposal from the United Nations:[14]

> The Universal Declaration of Human Rights describes the family as the natural and fundamental unit of society. [Article 16][15] It follows that any choice and decision with regard to the size of the family must irrevocably rest with the family itself, and cannot be made by anyone else.

> — U Thant, Statement on Population by the Secretary-General of the United Nations[16]

In addition, Hardin also pointed out the problem of individuals acting in rational self-interest by claiming that if all members in a group used common resources for their own gain and with no regard for others, all resources would still eventually be depleted. Overall, Hardin argued against relying on conscience as a means of policing commons, suggesting that this favors selfish individuals – often known as free riders – over those who are more altruistic.[17]

In the context of avoiding over-exploitation of common resources, Hardin concluded by restating Hegel's maxim (which was quoted by Engels), "freedom is the recognition of necessity".[18] He suggested that "freedom" completes the tragedy of the commons. By recognizing resources as commons in the first place, and by recognizing that, as such, they require management, Hardin believed that humans "can preserve and nurture other and more precious freedoms".[14]

### The "Commons" as a modern resource concept[edit]

Hardin's article marked the mainstream acceptance of the term "commons" as used to connote a shared resource.[19] As Frank van Laerhoven and Elinor Ostrom have stated: "Prior to the publication of Hardin’s article on the tragedy of the commons (1968), titles containing the words 'the commons', 'common pool resources,' or 'common property' were very rare in the academic literature."[20] They go on to say: "In 2002, Barrett and Mabry conducted a major survey of biologists to determine which publications in the twentieth century had become classic books or benchmark publications in biology.[21][22] They report that Hardin’s 1968 article was the one having the greatest career impact on biologists and is the most frequently cited".[23] However, the Ostroms point out that Hardin's analysis was based on crucial misconceptions about the nature of common property systems.

### System archetype[edit]

Causal loop diagram of the "tragedy of the commons"

In systems theory, the commons problem is one of the ten most common system archetypes. The Tragedy of the Commons archetype can be illustrated using a causal loop diagram.[24]

## Application[edit]

### Metaphoric meaning[edit]

Like Lloyd and Thomas Malthus before him, Hardin was primarily interested in the problem of human population growth. But in his essay, he also focused on the use of larger (though finite) resources such as the Earth's atmosphere and oceans, as well as pointing out the "negative commons" of pollution (i.e., instead of dealing with the deliberate privatization of a positive resource, a "negative commons" deals with the deliberate commonization of a negative cost, pollution).

As a metaphor, the tragedy of the commons should not be taken too literally. The "tragedy" is not in the word's conventional or theatric sense, nor a condemnation of the processes that lead to it. Similarly, Hardin's use of "commons" has frequently been misunderstood, leading him to later remark that he should have titled his work "The Tragedy of the Unregulated Commons".[25][26]

The metaphor illustrates the argument that free access and unrestricted demand for a finite resource ultimately reduces the resource through over-exploitation, temporarily or permanently. This occurs because the benefits of exploitation accrue to individuals or groups, each of whom is motivated to maximize use of the resource to the point in which they become reliant on it, while the costs of the exploitation are borne by all those to whom the resource is available (which may be a wider class of individuals than those who are exploiting it). This, in turn, causes demand for the resource to increase, which causes the problem to snowball until the resource collapses (even if it retains a capacity to recover). The rate at which depletion of the resource is realized depends primarily on three factors: the number of users wanting to consume the common in question, the consumptive nature of their uses, and the relative robustness of the common.[27]

The same concept is sometimes called the "tragedy of the fishers", because fishing too many fish before or during breeding could cause stocks to plummet.[28]

### Modern commons[edit]

An over-grazed landscape

The tragedy of the commons can be considered in relation to environmental issues such as sustainability.[29] The commons dilemma stands as a model for a great variety of resource problems in society today, such as water, forests,[30] fish, and non-renewable energy sources such as oil, gas, and coal.

Hardin's model posits that the tragedy of the commons may emerge if individuals prioritize self-interest.[31] Government regulations have been instituted to avert resource degradation. However, extensive research spanning decades highlights instances where community-level resource management, operating independently of government intervention, has effectively overseen common resources. In the United States, fishing communities employ a strategy wherein access to local fishing areas is restricted to accepted members, resembling a private, members-only club. Membership is sustained through fee payments, and outsiders are met with resistance, showcasing a quasi-privatized system.[citation needed]

Another case study involves beavers in Canada, historically crucial for natives who, as stewards, organized to hunt them for food and commerce. Non-native trappers, motivated by fur prices, contributed to resource degradation, wresting control from the indigenous population. Conservation laws enacted in the 1930s in response to declining beaver populations led to the expulsion of trappers, legal acknowledgment of natives, and enforcement of customary laws. This intervention resulted in productive harvests by the 1950s.(Feit, Harvey A. (2005). "Re-cognizing Co-management as Co-governance: Visions and Histories of Conservation at James Bay". Anthropologica. 47 (2): 267–288. JSTOR 25606240.)

These case studies underscore the need to reevaluate the tragedy of the commons model. Significant advocacy for a "benefits of the commons" perspective emphasizes successful community management of common-pool resources. However, specific case studies reveal exclusionary practices by those managing the commons towards others, introducing nuances into communal resource management discourse.[citation needed]

While the "benefits of the commons" perspective highlight successful community management, potential drawbacks in exclusionary practices indicate that the communal resource management model may not universally guarantee equitable access. This nuanced understanding invites further exploration of the complexities of balancing community interests and individual access to shared resources.[citation needed]

Situations exemplifying the "tragedy of the commons" include the overfishing and destruction of the Grand Banks of Newfoundland, the destruction of salmon runs on rivers that have been dammed[32] (most prominently in modern times on the Columbia River in the Northwest United States and historically in North Atlantic rivers), and the devastation of the sturgeon fishery (in modern Russia, but historically in the United States as well). In terms of water supply, another example is the limited water available in arid regions (e.g., the area of the Aral Sea and the Los Angeles water system supply, especially at Mono Lake and Owens Lake).

In economics, an externality is a cost or benefit that affects a party who did not choose to incur that cost or benefit.[33][34] Negative externalities are a well-known feature of the "tragedy of the commons". For example, driving cars has many negative externalities; these include pollution, carbon emissions, and traffic accidents. Every time Person A gets in a car, it becomes more likely that Person Z will suffer in each of those areas.[35] Economists often urge the government to adopt policies that "internalize" an externality.[36]

The tragedy of the commons can also refer to the idea of open data.[37] Anonymised data are crucial for useful social research and represent therefore a public resource - better said, a common good - which is liable to exhaustion.[38] Some feel that the law should provide a safe haven for the dissemination of research data, since it can be argued that current data protection policies overburden valuable research without mitigating realistic risks.[39]

An expansive application of the concept can also be seen in Vyse's[40] analysis of differences between countries in their responses to the COVID-19 pandemic.[41] Vyse argues that those who defy public health recommendations can be thought of as spoiling a set of common goods,[42] "the economy, the healthcare system, and the very air we breathe,[43] for all of us. In a similar vein, it has been argued that higher sickness and mortality rates from COVID-19 in individualistic cultures with less obligatory collectivism,[44] is another instance of the "tragedy of the commons".

### Tragedy of the digital commons[edit]

In the past two decades, scholars have been attempting to apply the concept of the tragedy of the commons to the digital environment. However, between scholars there are differences on some very basic notions inherent to the tragedy of the commons: the idea of finite resources and the extent of pollution.[20] On the other hand, there seems to be some agreement on the role of the digital divide and how to solve a potential tragedy of the digital commons.[20]

#### Resources[edit]

Many digital resources have properties that make them vulnerable to the tragedy of the commons, including data,[45] virtual artifacts[46] and even limited user attention.[47] Closely related are the physical computational resources, such as CPU, RAM, and network bandwidth, that digital communities on shared servers rely upon and govern.[48] Some scholars argue that digital resources are infinite, and therefore immune to the tragedy of the commons, because downloading a file does not constitute the destruction of the file in the digital environment,[49] and because it can be replicated and disseminated throughout the digital environment.[50] However, it can still be considered a finite resource within the context of privacy laws and regulations that limit access to it.[51]

Finite digital resources can thus be digital commons. An example is a database that requires persistent maintenance, such as Wikipedia. As a non-profit, it survives on a network of people contributing to maintain a knowledge base without expectation of direct compensation. This digital resource will deplete as Wikipedia may only survive if it is contributed to and used as a commons. The motivation for individuals to contribute is reflective of the theory because, if humans act in their own immediate interest and no longer participate, then the resource becomes misinformed or depleted. Arguments surrounding the regulation and mitigation requirements for digital resources may become reflective of natural resources.[52][53]

This raises the question whether one can view access itself as a finite resource in the context of a digital environment. Some scholars argue this point, often pointing to a proxy for access that is more concrete and measurable.[54] One such proxy is bandwidth, which can become congested when too many people try to access the digital environment.[50][55] Alternatively, one can think of the network itself as a common resource which can be exhausted through overuse.[56] Therefore, when talking about resources running out in a digital environment, it could be more useful to think in terms of the access to the digital environment being restricted in some way; this is called information entropy.[57]

#### Pollution[edit]

In terms of pollution, there are some scholars who look only at the pollution that occurs in the digital environment itself.[58] They argue that unrestricted use of digital resources can cause an overproduction of redundant data which causes noise and corrupts communication channels within the digital environment.[50] Others argue that the pollution caused by the overuse of digital resources also causes pollution in the physical environment.[59] They argue that unrestricted use of digital resources causes misinformation, fake news, crime, and terrorism, as well as problems of a different nature such as confusion, manipulation, insecurity, and loss of confidence.[60][61]

#### Digital divide and solutions[edit]

Scholars disagree on the particularities underlying the tragedy of the digital commons; however, there does seem to be some agreement on the cause and the solution.[20] The cause of the tragedy of the commons occurring in the digital environment is attributed by some scholars to the digital divide.[20] They argue that there is too large a focus on bridging this divide and providing unrestricted access to everyone. Such a focus on increasing access without the necessary restrictions causes the exploitation of digital resources for individual self-interest that is underlying any tragedy of the commons.[50][55]

In terms of the solution, scholars agree that cooperation rather than regulation is the best way to mitigate a tragedy of the digital commons.[20] The digital world is not a closed system in which a central authority can regulate the users, as such some scholars argue that voluntary cooperation must be fostered.[55] This could perhaps be done through digital governance structure that motivates multiple stakeholders to engage and collaborate in the decision-making process.[61] Other scholars argue more in favor of formal or informal sets of rules, like a code of conduct, to promote ethical behavior in the digital environment and foster trust.[50][62] Alternative to managing relations between people, some scholars argue that it is access itself that needs to be properly managed, which includes expansion of network capacity.[56]

#### Patents and technology[edit]

Patents are effectively a limited-time exploitation monopoly given to inventors. Once the period has elapsed, the invention is in principle free to all, and many companies do indeed commercialize such products, now market-proven. However, around 50% of all patent applications do not reach successful commercialization at all, often due to immature levels of components or marketing failures by the innovators. Scholars have suggested that since investment is often connected to patentability, such inactive patents form a rapidly growing category of underprivileged technologies and ideas that, under current market conditions, are effectively unavailable for use.[63] Thus, "Under the current system, people are encouraged to register new patents, and are discouraged from using publicly available patents."[63]: 765 The case might be particularly relevant to technologies that are relatively more environmentally/human damaging but also somewhat costlier than other alternatives developed contemporaneously.[63]: 766

## Examples[edit]

More general examples (some alluded to by Hardin) of potential and actual tragedies include:

Clearing rainforest for agriculture in southern Mexico

* Physical resources
* Uncontrolled human population growth leading to overpopulation.[9]
* Atmosphere: through the release of pollution that leads to ozone depletion, global warming, ocean acidification (by way of increased atmospheric CO2 being absorbed by the sea), and particulate pollution.[64]
* Light pollution: with the loss of the night sky for research and cultural significance, affected human, flora and fauna health, nuisance, trespass and the loss of enjoyment or function of private property.[65]
* Water: Water pollution, water crisis of over-extraction of groundwater and wasting water due to overirrigation.[66]
* Forests: Frontier logging of old growth forest and slash and burn.[67]
* Energy resources and climate: Environmental residue of mining and drilling, burning of fossil fuels and consequential global warming.[68]
* Animals: Habitat destruction and poaching leading to the Holocene mass extinction.[69]
* Oceans: Overfishing[70][71]
* Space debris in Earth's surrounding space leading to limited locations for new satellites and the obstruction of universal observations.[72]
* Human health
* In many African and Asian countries, patriarchal culture creates a preference for sons that causes some people to abort foetal girls. This results in an imbalanced sex ratio in these countries to the extent that they have significantly more males than females,[73] even though the natural male to female ratio is about 1.04 to 1.[74]
* Antibiotics - antibiotic resistance: Misuse of antibiotics anywhere in the world will eventually result in antibiotic resistance developing at an accelerated rate.[75] The resulting antibiotic resistance has spread (and will likely continue to do so in the future) to other bacteria and other regions, hurting or destroying the Antibiotic Commons that is shared on a worldwide basis.[76]
* Vaccines - Herd immunity: Avoiding a vaccine shot and relying on the established herd immunity instead will avoid potential vaccine risks, but if everyone does this, it will diminish herd immunity and bring risk to people who cannot receive vaccines for medical reasons.[77]
* Other
* Knowledge commons encompass immaterial and collectively owned goods in the information age, including, for example:
* Source code and software documentation in software projects that can get "polluted" with messy code or inaccurate information.[78]
* Skills acquisition and training, when all parties involved pass the buck on implementing it.[79]

### Application to evolutionary biology[edit]

A parallel was drawn in 2006 between the tragedy of the commons and the competing behaviour of parasites that, through acting selfishly, eventually diminish or destroy their common host.[80] The idea has also been applied to areas such as the evolution of virulence or sexual conflict, where males may fatally harm females when competing for matings.[81]

The idea of evolutionary suicide, where adaptation at the level of the individual causes the whole species or population to be driven extinct, can be seen as an extreme form of an evolutionary tragedy of the commons.[82][83] From an evolutionary point of view, the creation of the tragedy of the commons in pathogenic microbes may provide us with advanced therapeutic methods.[84][85]

Microbial ecology studies have also addressed if resource availability modulates the cooperative or competitive behaviour in bacteria populations. When resources availability is high, bacterial populations become competitive and aggressive with each other, but when environmental resources are low, they tend to be cooperative and mutualistic.[86]

Ecological studies have hypothesised that competitive forces between animals are major in high carrying capacity zones (i.e., near the Equator), where biodiversity is higher, because of natural resources abundance. This abundance or excess of resources, causes animal populations to have "r" reproduction strategies (many offspring, short gestation, less parental care, and a short time until sexual maturity), so competition is affordable for populations. Also, competition could select populations to have "r" behaviour in a positive feedback regulation.[87]

Contrary, in low carrying capacity zones (i.e., far from the equator), where environmental conditions are harsh K strategies are common (longer life expectancy, produce relatively fewer offspring and tend to be altricial, requiring extensive care by parents when young) and populations tend to have cooperative or mutualistic behaviors. If populations have a competitive behaviour in hostile environmental conditions they mostly are filtered out (die) by environmental selection; hence, populations in hostile conditions are selected to be cooperative.[88]

### Climate change[edit]

Main article: Climate change

The effects of climate change have been given as a mass example of the tragedy of the commons.[89] This perspective proposes that the earth, being the commons, has suffered a depletion of natural resources without regard to the externalities, the impact on neighboring and future populations. The collective actions of individuals, organisations, and governments continue to contribute to environmental degradation. Mitigation of the long-term impacts and tipping points require strict controls or other solution, but this may come as a loss to different industries. The sustainability of population and industry growth is the subject of climate change discussion. The global commons of environmental resource consumption or selfishness, as in the fossil fuel industry has been theorised as not realistically manageable. This is due to the crossing of irreversible thresholds of impact before the costs are entirely realised.[90]

## Commons dilemma[edit]

The commons dilemma is a specific class of social dilemma in which people's short-term selfish interests are at odds with long-term group interests and the common good.[91] In academia, a range of related terminology has also been used as shorthand for the theory or aspects of it, including resource dilemma, take-some dilemma, and common pool resource.[92]

Commons dilemma researchers have studied conditions under which groups and communities are likely to under- or over-harvest common resources in both the laboratory and field. Research programs have concentrated on a number of motivational, strategic, and structural factors that might be conducive to management of commons.[93]

In game theory, which constructs mathematical models for individuals' behavior in strategic situations, the corresponding "game", developed by Hardin, is known as the Commonize Costs – Privatize Profits Game (CC–PP game).[94]

### Psychological factors[edit]

Kopelman, Weber, & Messick (2002), in a review of the experimental research on cooperation in commons dilemmas, identify nine classes of independent variables that influence cooperation in commons dilemmas: social motives, gender, payoff structure, uncertainty, power and status, group size, communication, causes, and frames.[95] They organize these classes and distinguish between psychological individual differences (stable personality traits) and situational factors (the environment).[96] Situational factors include both the task (social and decision structure) and the perception of the task.[97]

Empirical findings support the theoretical argument that the cultural group is a critical factor that needs to be studied in the context of situational variables.[98][99] Rather than behaving in line with economic incentives, people are likely to approach the decision to cooperate with an appropriateness framework.[100] An expanded, four factor model of the Logic of Appropriateness,[101][102] suggests that the cooperation is better explained by the question: "What does a person like me (identity) do (rules) in a situation like this (recognition) given this culture (group)?"

### Strategic factors[edit]

Strategic factors also matter in commons dilemmas. One often-studied strategic factor is the order in which people take harvests from the resource. In simultaneous play, all people harvest at the same time, whereas in sequential play people harvest from the pool according to a predetermined sequence – first, second, third, etc.[103] There is a clear order effect in the latter games: the harvests of those who come first – the leaders – are higher than the harvest of those coming later – the followers.[104] The interpretation of this effect is that the first players feel entitled to take more. With sequential play, individuals adopt a first come-first served rule, whereas with simultaneous play people may adopt an equality rule.[105] Another strategic factor is the ability to build up reputations.[106] Research found that people take less from the common pool in public situations than in anonymous private situations. Moreover, those who harvest less gain greater prestige and influence within their group.[107]

### Structural factors[edit]

Hardin stated in his analysis of the tragedy of the commons that "Freedom in a commons brings ruin to all."[108] One of the proposed solutions is to appoint a leader to regulate access to the common.[109] Groups are more likely to endorse a leader when a common resource is being depleted and when managing a common resource is perceived as a difficult task.[110] Groups prefer leaders who are elected, democratic, and prototypical of the group, and these leader types are more successful in enforcing cooperation.[111] A general aversion to autocratic leadership exists, although it may be an effective solution, possibly because of the fear of power abuse and corruption.[112]

The provision of rewards and punishments may also be effective in preserving common resources.[113] Selective punishments for overuse can be effective in promoting domestic water and energy conservation – for example, through installing water and electricity meters in houses.[113] Selective rewards work, provided that they are open to everyone. An experimental carpool lane in the Netherlands failed because car commuters did not feel they were able to organize a carpool.[114] The rewards do not have to be tangible. In Canada, utilities considered putting "smiley faces" on electricity bills of customers below the average consumption of that customer's neighborhood.[115]

## Solutions[edit]

See also: Externality § Possible solutions

Articulating solutions to the tragedy of the commons is one of the main problems of political philosophy.[116][117] In some situations, locals implement (often complex) social schemes that work well.[118] When these fail, there are many possible governmental solutions such as privatization, internalizing the externalities, and regulation.[118]

### Non-governmental solution[edit]

Robert Axelrod contends that even self-interested individuals will often find ways to cooperate, because collective restraint serves both the collective and individual interests.[119] Anthropologist G. N. Appell criticized those who cited Hardin to "impos[e] their own economic and environmental rationality on other social systems of which they have incomplete understanding and knowledge."[120]

Political scientist Elinor Ostrom, who was awarded 2009's Nobel Memorial Prize in Economic Sciences for her work on the issue, and others revisited Hardin's work in 1999.[121] They found the tragedy of the commons not as prevalent or as difficult to solve as Hardin maintained, since locals have often come up with solutions to the commons problem themselves.[122] For example, another group found that a commons in the Swiss Alps has been run by a collective of farmers there to their mutual and individual benefit since 1517, in spite of the farmers also having access to their own farmland.[123] In general, it is in the interest of the users of a commons to keep them functioning and so complex social schemes are often invented by the users for maintaining them at optimum efficiency.[124][125] Another prominent example of this is the deliberative process of granting legal personhood to a part of nature, for example rivers, with the aim of preserving their water resources and prevent environmental degradation. This process entails that a river is regarded as its own legal entity that can sue against environmental damage done to it while being represented by an independently appointed guardian advisory group.[126] This has happened as a bottom-up process in New Zealand: Here debates initiated by the Whanganui Iwi tribe have resulted in legal personhood for the river. The river is considered as a living whole, stretching from mountain to sea and even includes not only the physical but also its metaphysical elements.[127]

Similarly, geographer Douglas L. Johnson remarks that many nomadic pastoralist societies of Africa and the Middle East in fact "balanced local stocking ratios against seasonal rangeland conditions in ways that were ecologically sound", reflecting a desire for lower risk rather than higher profit; in spite of this,[128] it was often the case that "the nomad was blamed for problems that were not of his own making and were a product of alien forces."[129] Independently finding precedent in the opinions of previous scholars such as Ibn Khaldun as well as common currency in antagonistic cultural attitudes towards non-sedentary peoples,[129] governments and international organizations have made use of Hardin's work to help justify restrictions on land access and the eventual sedentarization of pastoral nomads despite its weak empirical basis.[130] Examining relations between historically nomadic Bedouin Arabs and the Syrian state in the 20th century, Dawn Chatty notes that "Hardin's argument was curiously accepted as the fundamental explanation for the degradation of the steppe land"[131] in development schemes for the arid interior of the country, downplaying the larger role of agricultural overexploitation in desertification as it melded with prevailing nationalist ideology which viewed nomads as socially backward and economically harmful.[132]

Elinor Ostrom and her colleagues looked at how real-world communities manage communal resources, such as fisheries, land irrigation systems, and farmlands, and they identified a number of factors conducive to successful resource management.[133] One factor is the resource itself; resources with definable boundaries (e.g. land) can be preserved much more easily.[134] A second factor is resource dependence; there must be a perceptible threat of resource depletion, and it must be difficult to find substitutes.[135] The third is the presence of a community; small and stable populations with a thick social network and social norms promoting conservation do better.[124] A final condition is that there be appropriate community-based rules and procedures in place with built-in incentives for responsible use and punishments for overuse.[136] When the commons is taken over by non-locals, those solutions can no longer be used.[122]

Many of the economic and social structures recommended by Ostrom coincide with the structures recommended by anarchists, particularly green anarchism.[137] The largest contemporary societies that use these organizational strategies are the Rebel Zapatista Autonomous Municipalities and the Autonomous Administration of North and East Syria which have heavily been influenced by anarchism and other versions of libertarian and ecological socialism.

Individuals may act in a deliberate way to avoid consumption habits that deplete natural resources. This consciousness promotes the boycotting of products or brands and seeking alternative, more sustainable options.

#### Altruistic punishment[edit]

Various well-established theories, such as theory of kin selection and direct reciprocity, have limitations in explaining patterns of cooperation emerging between unrelated individuals and in non-repeatable short-term interactions.[138][139] Studies have shown that punishment is an efficacious motivator for cooperation among humans.[140][141]

Altruistic punishment entails the presence of individuals that punish defectors from a cooperative agreement, although doing so is costly and provides no material gain. These punishments effectively resolve tragedy of the commons scenarios by addressing both first-order free rider problems (i.e. defectors free riding on cooperators) and second-order free rider problems (i.e. cooperators free riding on work of punishers).[142] Such results can only be witnessed when the punishment levels are high enough.

While defectors are motivated by self-interest and cooperators feel morally obliged to practice self-restraint, punishers pursue this path when their emotions are clouded by annoyance and anger at free riders.[143]

### Governmental solutions[edit]

Governmental solutions are used when the above conditions are not met (such as a community being larger than the cohesion of its social network).[144] Examples of government regulation include privatization, regulation, and internalizing the externalities.[145]

#### Privatization[edit]

One solution for some resources is to convert common good into private property (Coase 1960), giving the new owner an incentive to enforce its sustainability.[146] Libertarians and classical liberals cite the tragedy of the commons as an example of what happens when Lockean property rights to homestead resources are prohibited by a government.[147] They argue that the solution to the tragedy of the commons is to allow individuals to take over the property rights of a resource, that is, to privatize it.[148]

In England, this solution was attempted in the Inclosure Acts. According to Karl Marx in Das Kapital, this solution leads to increasing numbers of people being pushed into smaller and smaller pockets of common land which has yet to be privatised, thereby merely displacing and exacerbating the problem while putting an increasing number of people in precarious situations.[149] Economic historian Bob Allen coined the term "Engels' pause" to describe the period from 1790 to 1840, when British working-class wages stagnated and per-capita gross domestic product expanded rapidly during a technological upheaval.[150]

#### Regulation[edit]

In a typical example, governmental regulations can limit the amount of a common good that is available for use by any individual.[151] Permit systems for extractive economic activities including mining, fishing, hunting, livestock raising, and timber extraction are examples of this approach.[152] Similarly, limits to pollution are examples of governmental intervention on behalf of the commons.[153] This idea is used by the United Nations Moon Treaty, Outer Space Treaty and Law of the Sea Treaty as well as the UNESCO World Heritage Convention (treaty) which involves the international law principle that designates some areas or resources the Common Heritage of Mankind.[154][155][156]

In Hardin's essay, he proposed that the solution to the problem of overpopulation must be based on "mutual coercion, mutually agreed upon" and result in "relinquishing the freedom to breed". Hardin discussed this topic further in a 1979 book, Managing the Commons, co-written with John A. Baden.[157][158] He framed this prescription in terms of needing to restrict the "reproductive right", to safeguard all other rights. Several countries have a variety of population control laws in place.[159]

German historian Joachim Radkau thought Hardin advocates strict management of common goods via increased government involvement or international regulation bodies.[160] An asserted impending "tragedy of the commons" is frequently warned of as a consequence of the adoption of policies which restrict private property and espouse expansion of public property.[161][162]

Giving legal rights of personhood to objects in nature is another proposed solution. The idea of giving land a legal personality is intended to enable the democratic system of the rule of law to allow for prosecution, sanction, and reparation for damage to the earth.[163] For example, this has been put into practice in Ecuador in the form of a constitutional principle known as "Pacha Mama" (Mother Earth).[164]

#### Internalizing externalities[edit]

Privatization works when the person who owns the property (or rights of access to that property) pays the full price of its exploitation.[165] As discussed above negative externalities (negative results, such as air or water pollution, that do not proportionately affect the user of the resource) is often a feature driving the tragedy of the commons.[166] Internalizing the externalities, in other words ensuring that the users of resource pay for all of the consequences of its use, can provide an alternate solution between privatization and regulation.[167] One example is gasoline taxes which are intended to include both the cost of road maintenance and of air pollution.[168] This solution can provide the flexibility of privatization while minimizing the amount of government oversight and overhead that is needed.[169]

### The mid-way solution[edit]

One of the significant actions areas which can dwell as potential solution is to have co-shared communities that have partial ownership from governmental side and partial ownership from the community.[170] By ownership, here it is referred to planning, sharing, using, benefiting and supervision of the resources which ensure that the power is not held in one or two hands only.[171] Since, involvement of multiple stakeholders is necessary responsibilities can be shared across them based on their abilities and capacities in terms of human resources, infrastructure development ability, and legal aspects, etc.[172]

## Criticism[edit]

### Commons in historical reality[edit]

Common land in Dartmoor, England c. 1813 (watercolor, J. M. W. Turner)

The status of common land in England as mentioned in Lloyd's pamphlet has been widely misunderstood.

Millions of acres were "common land", but this did not mean public land open to everybody, a popular fallacy. There was no such thing as ownerless land. Every parcel of "common" land had a legal owner, who was a private person or corporation. The owner was called the lord of the manor[173] (which, like landlord, was a legal term denoting ownership, not aristocratic status).

It was true that there were local people, called commoners, defined as those who had a legal right to use his land for some purpose of their own, typically grazing their animals. Certainly their rights were strong, because the lord was not entitled to build on his own land, or fence off any part of it,[174][175] unless he could prove he had left enough pasture for the commoners.[176] But these individuals were not the general public at large: not everyone in the vicinity was a commoner.[177]

Furthermore the commoners' right to graze the lord's land with their animals was restricted by law - precisely in order to prevent overgrazing.[178] If overgrazing did nevertheless occur, which it sometimes did, it was because of incompetent or weak land management,[179] and not because of the pressure of an unlimited right to graze, which did not exist.

Hence Christopher Rodgers said that "Hardin's influential thesis on the 'tragedy of the commons' ... has no application to common land in England and Wales. It is based on a false premise". Rodgers, professor of law at Newcastle University, added:

> Far from suffering a tragedy of the commons in Hardin's sense, common land .. was subject to common law principles of customary origin that promoted 'sustainable management'. These were expressed through property rights, in the form of qualifications on the resource use conferred by property entitlements, and were administered by local manor courts... Moreover, the administration of customary rules by the manor courts represented a wholly different means for organising the management of common resources than the model posited by Hardin, which stresses the need for exclusive ownership by either individuals or government in order to promote the effective management of the resource.[180]

Every productive unit ("manor") had a manorial court; without it, the manor ceased to exist.[181] Manorial courts could fine commoners, and the lord of the manor for that matter,[182] for breaches of customary law, e.g. grazing too many cattle on the land. Customary law varied locally. It could not be altered without the consent of the whole body of the commoners,[183] except by getting an Act of Parliament.[184]

By the time of Lloyd's pamphlet (1833) the majority of land in England had been enclosed and had ceased to be common land,[185] a complex and controversial topic outside the scope of this article. That which remained may not have been good agricultural land anyway,[186] or the best managed. Lloyd takes for granted that common lands were inferior[187] and argues his over-grazing theory to explain it. He does not examine other possible causes e.g. common land was difficult to drain, to keep disease-free, and to use for improved cattle breeding.[188]

Likewise, Susan Jane Buck Cox argues that the common land example used to argue this economic concept is on very weak historical ground, and misrepresents what she terms was actually the "triumph of the commons":[189] the successful common usage of land for many centuries. She argues that social changes and agricultural innovation, and not the behaviour of the commoners, led to the demise of the commons.[190] In a similar vein, Carl Dahlman argues that commons were effectively managed to prevent overgrazing.[191]

### Others[edit]

Hardin's work is criticised as historically inaccurate in failing to account for the demographic transition,[192] and for failing to distinguish between common property and open access resources.[193][194] Radical environmentalist Derrick Jensen claims the tragedy of the commons is used as propaganda for private ownership.[195][196] He says it has been used by the political right wing to hasten the final enclosure of the "common resources" of third world and indigenous people worldwide, as a part of the Washington Consensus.[197] He argues that in true situations, those who abuse the commons would have been warned to desist and if they failed would have punitive sanctions against them. He says that rather than being called "The Tragedy of the Commons", it should be called "the Tragedy of the Failure of the Commons".[198]

Marxist geographer David Harvey has a similar criticism, noting that "The dispossession of indigenous populations in North America by 'productive' colonists, for instance, was justified because indigenous populations did not produce value",[199] and asks generally: "Why, for instance, do we not focus in Hardin's metaphor on the individual ownership of the cattle rather than on the pasture as a common?"[200]

Some authors, like Yochai Benkler, say that with the rise of the Internet and digitalisation, an economics system based on commons becomes possible again.[201] He wrote in his book The Wealth of Networks in 2006 that cheap computing power plus networks enable people to produce valuable products through non-commercial processes of interaction: "as human beings and as social beings, rather than as market actors through the price system".[202] He uses the term networked information economy to refer to a "system of production, distribution, and consumption of information goods characterized by decentralized individual action carried out through widely distributed, nonmarket means that do not depend on market strategies."[203] He also coined the term commons-based peer production for collaborative efforts based on sharing information.[204] Examples of commons-based peer production are Wikipedia, free and open source software and open-source hardware.[205]

Tragedy of the commons has served as a pretext for powerful private companies and/or governments to introduce regulatory agents or outsourcing on less powerful entities or governments, for the exploitation of their natural resources.[206][207][208] Powerful companies and governments can easily corrupt and bribe less powerful institutions or governments, to allow them exploit or privatize their resources, which causes more concentration of power and wealth in powerful entities.[209] This phenomenon is known as the resource curse.[210]

## Comedy of the commons[edit]

In certain cases, exploiting a resource more may be a good thing. Carol M. Rose, in a 1986 article, discussed the concept of the "comedy of the commons", where the public property in question exhibits "increasing returns to scale" in usage (hence the phrase, "the more the merrier"),[211] in that the more people use the resource, the higher the benefit to each one. Rose cites as examples commerce and group recreational activities. According to Rose, public resources with the "comedic" characteristic may suffer from under-investment rather than over usage.[212]

A modern example presented by Garrett Richards in environmental studies is that the issue of excessive carbon emissions can be tackled effectively only when the efforts are directly addressing the issues along with the collective efforts from the world economies.[213] Additionally, the more that nations are willing to collaborate and contribute resources, the higher the chances are for successful technological developments.[214]

## See also[edit]

* Bounded rationality – Making of satisfactory, not optimal, decisions
* Collective action problem – Type of social dilemma
* Conflict of interest – Situation when a party is involved in multiple interests
* Dutch disease – Theory in economics, the apparent causal relationship between the increase in the economic development of a specific sector (for example natural resources) and a decline in other sectors (like the manufacturing sector or agriculture).
* Externality – In economics, an imposed cost or benefit
* Credentialism and educational inflation – Unnecessary increases in jobs' educational requirementsPages displaying short descriptions of redirect targets
* The Evolution of Cooperation – 1984 book by Robert Axelrod
* Free-rider problem – Market failure benefitting non-paying users
* International Association for the Study of the Commons – Non-profit organization
* Jevons paradox – Efficiency leads to increased demand
* Nash equilibrium – Solution concept of a non-cooperative game
* Overfishing – Removal of a species of fish from water at a rate that the species cannot replenish
* Shark finning – Harvesting of fins from live sharks
* Pacific bluefin tuna – Species of fish
* Panic buying – Unusual pattern of purchase, when consumers buy unusually large amounts of a product in anticipation of, or after, a disaster or perceived disaster, or in anticipation of an incredibly large price increase or shortage.
* Parasitism (social offense) – Crime of living at the expense of othersPages displaying short descriptions of redirect targets
* Prisoner's dilemma – Standard example in game theory, wherein two parties may each act in an individually beneficial fashion to the detriment of both
* Race to the bottom – Repeated decisions by jurisdictions to compete for economic activity against one another by offering ever lower standards of regulation or taxationPages displaying wikidata descriptions as a fallback
* Resource curse – Theory that resource wealth slows growth
* Social trap – Type of 'tragedy of the commons'
* Somebody else's problem – Dismissive figure of speech
* Stone Soup – European folk story, the inverse of the tragedy
* Tragedy of the anticommons – Type of resource coordination breakdown
* Tyranny of small decisions – Economic phenomenon, a situation in which a number of decisions, individually small and insignificant in size and time perspective, cumulatively result in a larger and significant outcome which is neither optimal nor desired.
* Unscrupulous diner's dilemma – Game theory: n-player "prisoner's dilemma"
* Unintended consequences – Unforeseen outcomes of an action
* Universalisability – Concept in Kantian ethics
* Volunteer's dilemma – Game theory case weighing own/others' sacrifice, in which each player can either make a small sacrifice that benefits everybody, or instead wait in hope of benefiting from someone else's sacrifice

### Related concepts[edit]

* Enclosure – In England, appropriation of common land, depriving commoners of their ancient rights

Portals:

* Business and economics
* Environment

## References[edit]

### Notes[edit]

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172. ^ Pisani, Assunta, ed. (2018-10-24). Euro-Librarianship: Shared Resources, Shared Responsibilities. Routledge. doi:10.4324/9781315859590. ISBN 978-1-315-85959-0. S2CID 239912609.
173. ^ Hoskins 1963, p. 4
174. ^ Hoskins 1963, pp. 5–6
175. ^ Scrutton 1887, p. 60
176. ^ Halsbury's Laws of England 1903, pp. 505–6
177. ^ Hoskins 1963, p. 4
178. ^ Hoskins, W.G. (2015). "Common land and its origin". In Hoskins, W.G.; Stamp, L. Dudley (eds.). The Common Lands of England and Wales. HarperCollins. ISBN 9780007342228.
179. ^ Scrutton 1887, pp. 121–3
180. ^ Rodgers, Christopher (2010). "Reversing the 'Tragedy' of the Commons? Sustainable Management and the Commons Act 2006". The Modern Law Review. 73 (3): 461–486. doi:10.1111/j.1468-2230.2010.00802.x. JSTOR 40660736.. pp. 462, 463
181. ^ Scrutton 1887, p. 18
182. ^ Scrutton 1887, p. 21
183. ^ Hoskins 1963, p. 4
184. ^ For the disputed origins of manorial and commons law, and whether it came from ancient folk customs or from grants by early landowners, see Scrutton 1887, pp. 1–41; Hoskins 1963, pp. 5–8, 27–34.
185. ^ Scrutton 1887, pp. 113–4.
186. ^ Hoskins 1963, p. xv.
187. ^ "Why are the cattle on a common so puny and stunted? Why is the common itself so bare-worn, and cropped so differently from the adjoining inclosures?": Lloyd 1833, [30]-[31]
188. ^ Scrutton 1887, pp. 115–121
189. ^ Cox, Susan Jane Buck (1985). "No Tragedy of the Commons". Environmental Ethics. 7 (1): 49–61. doi:10.5840/enviroethics1985716. ISSN 0163-4275.
190. ^ Cox, Susan Jane Buck (1985). "No Tragedy on the Commons" (PDF). Environmental Ethics. 7 (1): 49–61. doi:10.5840/enviroethics1985716. hdl:10535/3113.
191. ^ Dahlman, Carl J. (1991). "The tragedy of the commons that wasn't: On technical solutions to the institutions game". Population and Environment. 12 (3): 285–296. doi:10.1007/BF01357919. S2CID 154166211.
192. ^ Dasgupta, Partha (2001). Human Well-Being and the Natural Environment. Oxford University Press. ISBN 978-0-19-924788-2.
193. ^ Ciriacy-Wantrup, S.; Bishop, Richard (1975). "Common Property as a Concept in Natural Resources Policy". Natural Resources Journal. 15 (4): 713–727. ISSN 0028-0739.
194. ^ Rowe, Jonathan (2008). "The parallel Economy of the Commons". State of the World 2008: Innovation for a Sustainable Development. London, UK: Earthscan: 142.
195. ^ Puzon, Klarizze; Willinger, Marc (2019). "Can Common Ownership Prevent the Tragedy of the Commons? An Experimental Investigation". SSRN Electronic Journal. doi:10.2139/ssrn.3410383. ISSN 1556-5068. S2CID 201461194.
196. ^ Jensen, Derrick (2007), "Endgame Vol 1: The Problem of Civilization" and "Endgame Vol II: Resistance" (Seven Stories Press)
197. ^ Looney, Robert E. (1988), "Has Indigenous Third-World Arms Production been Effective in Reducing Third-World Arms Imports?", Third-World Military Expenditure and Arms Production, London: Palgrave Macmillan UK, pp. 99–113, doi:10.1007/978-1-349-09658-9_6, ISBN 978-1-349-09660-2, retrieved 2021-05-25
198. ^ Brennan, Jason (2012-04-29), "The Tragedy of the Commons", The Ethics of Voting, Princeton University Press, doi:10.23943/princeton/9780691154442.003.0011, ISBN 978-0-691-15444-2, retrieved 2021-05-25
199. ^ Young, Kue (2012-08-29). "Indigenous Populations of North America, Australasia, and Circumpolar North". Oxford Bibliographies Online Datasets. doi:10.1093/obo/9780199756797-0039. Retrieved 2021-05-25.
200. ^ Harvey, David (2011). "The future of the commons" (PDF). Radical History Review. 2011 (109): 101–107. doi:10.1215/01636545-2010-017.
201. ^ Benkler, Yochai (2016). "Peer production and cooperation". Handbook on the Economics of the Internet: 91–119. doi:10.4337/9780857939852.00012. ISBN 978-0-85793-985-2.
202. ^ Obokata, Tom (2006-01-01), "Chapter 4. Trafficking of Human Beings as a Human Rights Abuse: Obligations and Accountability of Non-State Actors", Trafficking of Human Beings from a Human Rights Perspective, Brill | Nijhoff, pp. 121–145, doi:10.1163/ej.9789004154056.i-247.30, ISBN 978-90-474-1106-2, retrieved 2021-05-25
203. ^ Benkler, Yochai (2006). The Wealth of Networks: How Social Production Transforms Markets and Freedom. New Haven, Conn: Yale University Press. p. 3. ISBN 978-0-300-11056-2.
204. ^ Steven Johnson (September 21, 2012). "The Internet? We Built That". New York Times. Retrieved 2012-09-24. "The Harvard legal scholar Yochai Benkler has called this phenomenon 'commons-based peer production'."
205. ^ "Introduction: Open Source Software and the Digital Commons", Incorporating the Digital Commons: Corporate Involvement in Free and Open Source Software, University of Westminster Press, pp. 1–32, 2020-02-26, doi:10.16997/book39.a, ISBN 978-1-912656-42-4, S2CID 242428235
206. ^ Karnani, Aneel G. (2013). "Corporate Social Responsibility Does Not Avert the Tragedy of the Commons -- Case Study: Coca-Cola India". SSRN Electronic Journal. doi:10.2139/ssrn.2354022. hdl:2027.42/100359. ISSN 1556-5068. S2CID 155003836.
207. ^ Sinden, Amy (2006). "The Tragedy of the Commons and the Myth of a Private Property Solution". SSRN Electronic Journal. doi:10.2139/ssrn.895724. hdl:20.500.12613/7454. ISSN 1556-5068. S2CID 154084058.
208. ^ Rowland, Wade (2009-09-01). "Corporate Social Responsibility and Garrett Hardin's Tragedy of the Commons as Myth and Reality". Journal of Corporate Citizenship. 2009 (35): 109–118. doi:10.9774/gleaf.4700.2009.au.00010. ISSN 1470-5001.
209. ^ Rajan, Sudhir Chella (September 2011). "Poor little rich countries: another look at the 'resource curse'". Environmental Politics. 20 (5): 617–632. Bibcode:2011EnvPo..20..617R. doi:10.1080/09644016.2011.608530. ISSN 0964-4016. S2CID 17155966.
210. ^ SHAXSON, NICHOLAS (2007-10-22). "Oil, corruption and the resource curse". International Affairs. 83 (6): 1123–1140. doi:10.1111/j.1468-2346.2007.00677.x. ISSN 0020-5850. S2CID 41888272.
211. ^ Rose, Carol (1986). "The Comedy of the Commons: Custom, Commerce, and Inherently Public Property". The University of Chicago Law Review. 53 (3): 711–781. doi:10.2307/1599583. ISSN 0041-9494. JSTOR 1599583.
212. ^ Rose, Carol M. (1986). "The Comedy of the Commons: Commerce, Custom, and Inherently Public Property". Faculty Scholarship Series, Yale Law School. Paper 1828.
213. ^ Rosenthal, Erika; Watson, Robert (April 2011). "Multilateral Efforts to Reduce Black Carbon Emissions: A Lifeline for the Warming Arctic?". Review of European Community & International Environmental Law. 20 (1): 3–10. doi:10.1111/j.1467-9388.2011.00705.x. ISSN 0962-8797.
214. ^ Richards, Garrett (2015-12-01). "Comedy of the Commons: Cheerful Options for Shared Resources in an Era of Climate Change". Alternatives. 41: 50.

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* Cox, Susan Jane Buck (1985). "No Tragedy on the Commons" (PDF). Environmental Ethics. 7 (1): 49–61. doi:10.5840/enviroethics1985716. hdl:10535/3113.
* Dixit, Avinash K.; Nalebuff, Barry J. (1993). Thinking Strategically: The Competitive Edge in Business, Politics, and Everyday Life. W. W. Norton & Company. ISBN 978-0-393-06979-2.
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* Kopelman, S.; Weber, M; Messick, D. (2002). "Factors Influencing Cooperation in Commons Dilemmas: A Review of Experimental Psychological Research". In Ostrom, E.; et al. (eds.). The Drama of the Commons. Washington, D.C.: National Academy Press. Ch. 4., 113–156. doi:10.17226/10287. ISBN 978-0-309-08250-1. S2CID 153794284.
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* Scrutton, Thomas Edward (1887). Commons and Common Fields. Cambridge University Press. Retrieved 18 December 2023.
* Van Vugt, M.; Van Lange, P. A. M.; Meertens, R. M.; Joireman, J. A. (1996). "How a Structural Solution to a Real-World Social Dilemma Failed: A Field Experiment on the First Carpool Lane in Europe" (PDF). Social Psychology Quarterly. 59 (4): 364–374. CiteSeerX 10.1.1.318.656. doi:10.2307/2787077. JSTOR 2787077. Archived from the original (PDF) on 2017-08-09.
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* Van Vugt, Mark (2009). "Triumph of the commons" (PDF). New Scientist. 203 (2722): 40–43. doi:10.1016/S0262-4079(09)62221-1.
* Weber, M.; Kopelman, S.; Messick, D. (2004). "A conceptual review of decision making in social dilemmas: applying the logic of appropriateness". Personality and Social Psychology Review. 8 (3): 281–307. doi:10.1207/s15327957pspr0803_4. PMID 15454350. S2CID 1525372.

## External links[edit]

Look up tragedy of the commons in Wiktionary, the free dictionary.

Wikiquote has quotations related to Tragedy of the Commons.

* The Digital Library of the Commons
* The Myth of the Tragedy of the Commons by Ian Angus
* "Global Tragedy of the Commons" by John Hickman and Sarah Bartlett
* "Tragedy of the Commons Explained with Smurfs" by Ryan Somma
* Public vs. Private Goods & Tragedy of the Commons
* On averting the Tragedy of the Commons

* v
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Topics of game theory

Definitions|

* Congestion game
* Cooperative game
* Determinacy
* Escalation of commitment
* Extensive-form game
* First-player and second-player win
* Game complexity
* Graphical game
* Hierarchy of beliefs
* Information set
* Normal-form game
* Preference
* Sequential game
* Simultaneous game
* Simultaneous action selection
* Solved game
* Succinct game
* Mechanism design

Equilibrium
concepts|

* Bayes correlated equilibrium
* Bayesian Nash equilibrium
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* Core
* Correlated equilibrium
* Coalition-proof Nash equilibrium
* Epsilon-equilibrium
* Evolutionarily stable strategy
* Gibbs equilibrium
* Mertens-stable equilibrium
* Markov perfect equilibrium
* Nash equilibrium
* Pareto efficiency
* Perfect Bayesian equilibrium
* Proper equilibrium
* Quantal response equilibrium
* Quasi-perfect equilibrium
* Risk dominance
* Satisfaction equilibrium
* Self-confirming equilibrium
* Sequential equilibrium
* Shapley value
* Strong Nash equilibrium
* Subgame perfection
* Trembling hand equilibrium

Strategies|

* Appeasement
* Backward induction
* Bid shading
* Collusion
* Cheap talk
* De-escalation
* Deterrence
* Escalation
* Forward induction
* Grim trigger
* Markov strategy
* Dominant strategies
* Pure strategy
* Mixed strategy
* Strategy-stealing argument
* Tit for tat

Classes
of games|

* Auction
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* Global game
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Games|

* Go
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* Chicken
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* Lewis signaling game
* Volunteer's dilemma
* Dollar auction
* Battle of the sexes
* Stag hunt
* Matching pennies
* Ultimatum game
* Electronic mail game
* Rock paper scissors
* Pirate game
* Dictator game
* Public goods game
* Blotto game
* War of attrition
* El Farol Bar problem
* Fair division
* Fair cake-cutting
* Bertrand competition
* Cournot competition
* Stackelberg competition
* Deadlock
* Diner's dilemma
* Guess 2/3 of the average
* Kuhn poker
* Nash bargaining game
* Induction puzzles
* Trust game
* Princess and monster game
* Rendezvous problem

Theorems|

* Aumann's agreement theorem
* Folk theorem
* Minimax theorem
* Nash's theorem
* Negamax theorem
* Purification theorem
* Revelation principle
* Sprague–Grundy theorem
* Zermelo's theorem

Key
figures|

* Albert W. Tucker
* Amos Tversky
* Antoine Augustin Cournot
* Ariel Rubinstein
* Claude Shannon
* Daniel Kahneman
* David K. Levine
* David M. Kreps
* Donald B. Gillies
* Drew Fudenberg
* Eric Maskin
* Harold W. Kuhn
* Herbert Simon
* Hervé Moulin
* John Conway
* Jean Tirole
* Jean-François Mertens
* Jennifer Tour Chayes
* John Harsanyi
* John Maynard Smith
* John Nash
* John von Neumann
* Kenneth Arrow
* Kenneth Binmore
* Leonid Hurwicz
* Lloyd Shapley
* Melvin Dresher
* Merrill M. Flood
* Olga Bondareva
* Oskar Morgenstern
* Paul Milgrom
* Peyton Young
* Reinhard Selten
* Robert Axelrod
* Robert Aumann
* Robert B. Wilson
* Roger Myerson
* Samuel Bowles
* Suzanne Scotchmer
* Thomas Schelling
* William Vickrey

Miscellaneous|

* Alpha–beta pruning
* Bounded rationality
* Combinatorial game theory
* Confrontation analysis
* Coopetition
* Evolutionary game theory
* Glossary of game theory
* List of game theorists
* List of games in game theory
* No-win situation
* Topological game
* Tragedy of the commons

* v
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* e

Property

By owner|

* Collective
* Common
* Communal
* Community
* Crown
* Customary
* Cooperative
* Private
* Public
* Self
* Social
* State
* Unowned

By nature|

* Estate
* Croft
* Intangible
* Intellectual
* indigenous
* Personal
* Tangible
* real

Commons|

* Common land
* Common-pool resource
* Digital
* Global
* Information
* Knowledge

Theory|

* Bundle of rights
* Commodity
* fictitious commodities
* Common good (economics)
* Excludability
* First possession
* appropriation
* homestead principle
* Free-rider problem
* Game theory
* Georgism
* Gift economy
* Labor theory of property
* Law of rent
* rent-seeking
* Legal plunder
* Natural rights
* Ownership
* Property rights
* primogeniture
* usufruct
* women's
* Right to property
* Rivalry
* Tragedy of the commons
* anticommons

Applications|

* Acequia (watercourse)
* Ejido (agrarian land)
* Forest types
* Huerta
* Inheritance
* Land tenure
* Property law
* alienation
* easement
* restraint on alienation
* real estate
* title

Rights|

* Air
* Fishing
* Forest-dwelling (India)
* Freedom to roam
* Grazing
* pannage
* Hunting
* Land
* aboriginal
* indigenous
* squatting
* Littoral
* Mineral
* Bergregal
* Right of way (transit)
* Right of way (property access)
* Water
* prior-appropriation
* riparian

Disposession/
redistribution|

* Bioprospecting
* Collectivization
* Eminent domain
* Enclosure
* Eviction
* Expropriation
* Farhud
* Forced migration
* population transfer
* repatriation
* Illegal fishing
* Illegal logging
* Land Back
* Land reform
* Legal plunder
* Piracy
* Poaching
* Primitive accumulation
* Privatization
* Regulatory taking
* Slavery
* bride buying
* human trafficking
* spousal
* husband-selling
* wife selling
* wage
* Tax
* inheritance
* poll
* progressive
* property
* Theft

Scholars
(key work)|

* Frédéric Bastiat
* The Law
* Ronald Coase
* Friedrich Engels
* The Origin of the Family, Private Property and the State
* Henry George
* Progress and Poverty
* Garrett Hardin
* David Harvey
* John Locke
* Two Treatises of Government
* Karl Marx
* Das Kapital
* Marcel Mauss
* The Gift
* John Stuart Mill
* Elinor Ostrom
* Karl Polanyi
* The Great Transformation
* Pierre-Joseph Proudhon
* What Is Property?
* David Ricardo
* Murray N. Rothbard
* The Ethics of Liberty
* Jean-Jacques Rousseau
* The Social Contract
* Adam Smith
* The Wealth of Nations

* Categories: Property
* Property law
* by country

* v
* t
* e

Sustainability

* Outline
* Index

Principles|

* Anthropocene
* Business action on climate change
* Business ethics
* Co-benefits of climate change mitigation
* Corporate sustainability
* Earth system governance
* Ecological modernization
* Environmental governance
* Environmentalism
* Ethical consumerism
* Global catastrophic risk
* Green economy
* Green growth
* Human impact on the environment
* Longtermism
* Planetary boundaries
* Social sustainability
* Stewardship
* Sustainability studies
* Capitalism
* Development
* Developmment goals
* Finance

Consumption|

* Anthropization
* Anti-consumerism
* Circular economy
* Earth Overshoot Day
* Ecological footprint
* Ethical
* Green
* Micro-sustainability
* Over-consumption
* Product stewardship
* Simple living
* Social return on investment
* Steady-state economy
* Sustainability
* Advertising
* Brand
* Marketing myopia
* Sustainable
* Consumer behaviour
* Market
* Systemic change resistance
* Tragedy of the commons

World population|

* Birth control
* Demographic transition
* Family planning
* Control
* Sustainable population
* Women's education and empowerment

Technology|

* Appropriate
* Digital sustainability
* Ecotechnology
* Environmental technology
* Environmental design
* High-performance buildings
* Natural building
* Superinsulation
* Sustainability science
* Sustainable architecture
* Sustainable design
* Sustainable design standards
* Sustainable flooring
* Sustainable industries
* Sustainable lighting
* Sustainable packaging
* Sustainable transport

Biodiversity|

* Biosecurity
* Biosphere
* Conservation biology
* Endangered species
* Holocene extinction
* Invasive species

Energy|

* Carbon footprint
* Climate change mitigation
* Conservation
* Descent
* Efficiency
* Electrification
* Emissions trading
* Energy conservation
* Energy efficiency implementation
* Fossil fuel divestment
* Fossil-fuel phase-out
* Peak oil
* Poverty
* Rebound effect
* Renewable

Food|

* Civic agriculture
* Climate-smart agriculture
* Community-supported agriculture
* Cultured meat
* Forest gardening
* Foodscaping
* Local
* Permaculture
* Security
* Sustainable agriculture
* Sustainable diet
* Sustainable fishery
* Urban horticulture
* Vegetable box scheme

Water|

* Conservation
* Desertification
* Efficiency
* Footprint
* Reclaimed
* Sanitation
* Scarcity
* Security

Accountability|

* Corporate environmental responsibility
* Corporate social responsibility
* Environmental accounting
* Environmental full-cost accounting
* Environmental planning
* Sustainability
* Accounting
* Measurement
* Metrics and indices
* Reporting
* Standards and certification
* Sustainable yield

Applications|

* Advertising
* Art
* Building insulation
* Business
* City
* Climate finance
* College programs
* Community
* Disinvestment
* Eco-capitalism
* Eco-investing
* Ecovillage
* Education
* Environmental finance
* Ethical banking
* Fashion
* Gardening
* Geopark
* Green
* Development
* Development
* Infrastructure
* Marketing
* Vehicle
* Impact investing
* Landscape
* Livelihood
* Living
* Low-impact development
* Market
* Music
* Organic movement
* Organizations
* Practices
* Procurement
* Public interest design
* Radical sustainability
* Refurbishment
* Social design
* Socially responsible business
* Socially responsible marketing
* Sourcing
* Space
* Sustainability organization
* Tourism
* Transport
* Urban drainage systems
* Urban infrastructure
* Urbanism

Sustainable management|

* Environmental
* Fisheries
* Forest
* Humanistic capitalism
* Landscape
* Materials
* Natural resource
* Planetary
* Waste

Agreements and
conferences|

* UN Conference on the Human Environment (Stockholm 1972)
* Brundtlandt Commission Report (1983)
* Our Common Future (1987)
* Earth Summit (1992)
* Rio Declaration on Environment and Development (1992)
* Agenda 21 (1992)
* Convention on Biological Diversity (1992)
* ICPD Programme of Action (1994)
* Lisbon Principles (1997)
* Kyoto Protocol (1997)
* Earth Charter (2000)
* UN Millennium Declaration (2000)
* Earth Summit 2002 (Rio+10, Johannesburg)
* UN Conference on Sustainable Development (Rio+20, 2012)
* Sustainable Development Goals (2015)
* Paris Agreement (2015)
* UN Ocean Conference (2017)

* Category
* Lists
* Science
* Studies
* Degrees

* v
* t
* e

Unintended consequences

* Abilene paradox
* Adverse effect
* Braess's paradox
* Butterfly effect
* Campbell's law
* Cobra effect
* CSI effect
* Externality
* Excess burden of taxation
* Four Pests campaign
* Goodhart's law
* Hawthorne effect
* Hutber's law
* Hydra effect
* Inverse consequences
* Jevons paradox
* Murphy's law
* Nocebo
* Osborne effect
* Parable of the broken window
* Paradox of enrichment
* Parkinson's law
* Perverse incentive
* Rebound effect (conservation)
* Risk compensation
* Self-defeating prophecy
* Self-refuting idea
* Serendipity
* Social trap
* Streisand effect
* Tragedy of the commons
* Tyranny of small decisions

* v
* t
* e

Environmentalism

* Outline of environmentalism

Key topics|

* Climate justice
* Ecological crisis
* Environmental conflict
* Environmental movement
* History
* List of environmental conflicts
* Organizations
* Environmental studies
* Human impact on the environment

Disciplines|

* Communication
* Ecology
* Education
* Ethics
* Health
* History
* Humanities
* Law
* Philosophy
* Politics
* Psychology
* Religion
* Science
* Social science
* Sociology

Views|

| Philosophical|

* Political ecology
* Environmental philosophy
* Biocentrism
* Deep ecology
* Earth jurisprudence
* Ecocentrism
* Resacralization of nature
* Social ecology

|

Political|

* Bioconservatism
* Bright green environmentalism
* Disinvestment
* Eco-capitalism
* Ecofascism
* Ecofeminism
* Eco-nationalism
* Eco-socialism
* Eco-terrorism
* Ecomodernism
* Free-market environmentalism
* Green anarchism
* Green conservatism
* Green left
* Green liberalism
* Green libertarianism
* Green politics
* Green syndicalism
* War on coal

Religious|

* Ecotheology
* Christianity
* Evangelical
* Islam
* Judaism
* Stewardship (theology)

Opposition|

* Anti-environmentalism
* Environmental skepticism
* List of environmental killings

* Biophilia hypothesis
* Environmentalism of the poor
* Environmental stewardship
* Hairshirt environmentalism
* Hardline
* Nature conservation
* Radical environmentalism

Offshoots|

* Anti-fracking movement
* Anti-nuclear movement
* Car-free movement
* Climate movement
* Conservation movement
* Cultural environmentalism
* Degrowth
* Earth Optimism
* Eco-anxiety
* Ecological grief
* Environmental defender
* Environmental justice
* Ethical banking
* Ethical consumerism
* Flight shame
* Impact investing
* Product stewardship
* Slow movement
* Sustainability organization

Goals|

* Circular economy
* Climate action
* Climate change mitigation
* Conservation community
* Ecological civilization
* Environmental personhood
* Environmental protection
* Environmental policy
* Environmental, social, and corporate governance
* Environmentally friendly
* Greening
* Green economy
* Greenwashing
* Natural resource management
* Environmental resource management
* Rights of nature
* Short-haul flight ban
* Sustainability
* Vegetarianism
* Protests
* Tree sitting

By country|

* Albania
* Australia
* Brazil
* Rio Grande do Sul
* China
* Anti-incinerator movement
* India
* Chipko movement
* Israel
* New Zealand
* Philippines
* South Africa
* Switzerland
* United Kingdom
* United States

In culture|

* Art
* Books
* Ecofiction
* Conspicuous conservation
* Film
* list
* festivals
* horror
* Journalism
* The Lord of the Rings
* Music
* Ecomusicology
* Motorsport
* Sculpture
* Surfing
* Tourism
* Eco hotel
* Publications

Environmentalists|

* Environmentalist
* Environmental defender
* Water protector

| Notable people|

* Sunderlal Bahuguna
* Murray Bookchin
* David Brower
* Rachel Carson
* Jacques Cousteau
* Ng Cho-nam
* Tim Flannery
* Al Gore
* Aldo Leopold
* Wangari Maathai
* Seyyed Hossein Nasr
* Chico Mendes
* John Muir
* Theodore Roosevelt
* Shōzō Tanaka
* Greta Thunberg

|

Related topics|

* Barriers to pro-environmental behaviour
* Business ethics
* Land ethic
* Lifeboat ethics
* Tragedy of the commons

Environment portal

* v
* t
* e

Population

Major topics|

* Demographics of the world
* Demographic transition
* Estimates of historical world population
* Population growth
* Population momentum
* Projections of population growth
* World population

Population
biology

* Population decline
* Population density
* Physiological density
* Population dynamics
* Population model
* Population pyramid

Population
ecology

* Biocapacity
* Carrying capacity
* Earth's energy budget
* I = P × A × T
* Kaya identity
* Malthusian growth model
* Overshoot (population)
* World3 model

Society and
population|

* Eugenics
* Dysgenics
* Human overpopulation
* Malthusian catastrophe
* Human population planning
* Compulsory sterilization
* Family planning
* One-child policy
* Two-child policy
* Overconsumption
* Political demography
* Population ethics
* Antinatalism
* Mere addition paradox
* Natalism
* Non-identity problem
* Reproductive rights
* Sustainable population
* Zero population growth

Publications|

* Population and Environment
* Population and Development Review

Lists|

* Population and housing censuses by country
* Largest cities
* World population milestones
* 6 billion
* 7
* 8
* Population concern organizations

Events and
organizations

* 7 Billion Actions
* Church of Euthanasia
* International Conference on Population and Development
* Population Action International
* Population Connection
* Population Matters
* United Nations Population Fund
* United Nations world population conferences
* Voluntary Human Extinction Movement
* World Population Conference
* World Population Day
* World Population Foundation

Related topics|

* Bennett's law
* Green Revolution
* Human impact on the environment
* Migration
* The Population Bomb
* Sustainability
* The Ultimate Resource
* White demographic decline

* Commons
* Category

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