Cournot competition

Short description: Economic model

Cournot competition is an economic model used to describe an industry structure in which companies compete on the amount of output they will produce, which they decide on independently of each other and at the same time. It is named after Antoine Augustin Cournot (1801–1877) who was inspired by observing competition in a spring water duopoly.[1] It has the following features:

* There is more than one firm and all firms produce a homogeneous product, i.e., there is no product differentiation;
* Firms do not cooperate, i.e., there is no collusion;
* Firms have market power, i.e., each firm's output decision affects the good's price;
* The number of firms is fixed;
* Firms compete in quantities rather than prices; and
* The firms are economically rational and act strategically, usually seeking to maximize profit given their competitors' decisions.

An essential assumption of this model is the "not conjecture" that each firm aims to maximize profits, based on the expectation that its own output decision will not have an effect on the decisions of its rivals. Price is a commonly known decreasing function of total output. All firms know N, the total number of firms in the market, and take the output of the others as given. The market price is set at a level such that demand equals the total quantity produced by all firms. Each firm takes the quantity set by its competitors as a given, evaluates its residual demand, and then behaves as a monopoly.

## Contents

* 1 History
* 1.1 The legacy of the Recherches
* 2 Cournot's conceptual framework
* 2.1 The 'Law of Demand' or 'of Sales'
* 3 Cournot's duopoly theory
* 3.1 Monopoly and duopoly
* 3.2 Cournot's price model
* 3.3 Interpretative difficulties
* 3.4 Collusion
* 4 Finding the Cournot duopoly equilibrium
* 4.1 Example 1
* 4.2 Example 2
* 4.3 Comparison with monopoly
* 4.4 Extension to oligopoly
* 5 Bertrand's critique
* 6 See also
* 7 Notes
* 8 References
* 9 Further reading

## History

“  | The state of equilibrium... is therefore stable; i.e., if either of the producers, misled as to his true interest, leaves it temporarily, he will be brought back to it.  | ”

|
|

— Antoine Augustin Cournot, Recherches sur les Principes Mathématiques de la Théorie des Richesses (1838), translated by Bacon (1897).[2]

Antoine Augustin Cournot (1801–1877) first outlined his theory of competition in his 1838 volume Recherches sur les Principes Mathématiques de la Théorie des Richesses as a way of describing the competition with a market for spring water dominated by two suppliers (a duopoly).[3] The model was one of a number that Cournot set out "explicitly and with mathematical precision" in the volume.[4] Specifically, Cournot constructed profit functions for each firm, and then used partial differentiation to construct a function representing a firm's best response for given (exogenous) output levels of the other firm(s) in the market.[4] He then showed that a stable equilibrium occurs where these functions intersect (i.e., the simultaneous solution of the best response functions of each firm).[4]

The consequence of this is that in equilibrium, each firm's expectations of how other firms will act are shown to be correct; when all is revealed, no firm wants to change its output decision.[1] This idea of stability was later taken up and built upon as a description of Nash equilibria, of which Cournot equilibria are a subset.[4]

### The legacy of the Recherches

Cournot's economic theory was little noticed until Léon Walras credited him as a forerunner. This led to an unsympathetic review of Cournot's book by Joseph Bertrand which in turn received heavy criticism. Irving Fisher found Cournot's treatment of oligopoly "brilliant and suggestive, but not free from serious objections".[5] He arranged for a translation to be made by Nathaniel Bacon in 1897.[6]

Reactions to this aspect of Cournot's theory have ranged from searing condemnation to half-hearted endorsement. It has received sympathy in recent years as a contribution to game theory rather than economics. James W. Friedman explains:

> In current language and interpretation, Cournot postulated a particular game to represent an oligopolistic market...[6]

The maths in Cournot's book is elementary and the presentation not difficult to follow. The account below follows Cournot's words and diagrams closely. The diagrams were presumably included as an oversized plate in the original edition, and are missing from some modern reprints.

## Cournot's conceptual framework

Cournot's discussion of oligopoly draws on two theoretical advances made in earlier pages of his book. Both have passed (with some adjustment) into microeconomic theory, particularly within subfield of Industrial Organization where Cournot's assumptions can be relaxed to study various Market Structures and Industries, for example, the Stackelberg Competition model. Cournot's discussion of monopoly influenced later writers such as Edward Chamberlin and Joan Robinson during the 1930s revival of interest in imperfect competition.

### The 'Law of Demand' or 'of Sales'

Cournot's curve of 'demand or sales'

Cournot was wary of psychological notions of demand, defining it simply as the amount sold of a particular good (helped along by the fact that the French word débit, meaning 'sales quantity', has the same initial letter as demande, meaning 'demand' [7]). He formalised it mathematically as follows:

> We will regard the sales quantity or annual demand

> D

> , for any commodity, to be a function

> F(p)

> of its price.[8]

It follows that his demand curves do some of the work of modern supply curves, since producers who are able to limit the amount sold have an influence on Cournot's demand curve.[according to whom?]

Cournot remarks that the demand curve will usually be a decreasing function of price, and that the total value of the good sold is pF(p), which will generally increase to a maximum and then decline towards 0. The condition for a maximum is that the derivative of pF(p), i.e., F(p)+pF′(p), should be 0 (where F′(p) is the derivative of F(p)).

## Cournot's duopoly theory

### Monopoly and duopoly

Cournot insists that each duopolist seeks independently to maximize profits, and this restriction is essential, since Cournot tells us that if they came to an understanding between each other so as each to obtain the maximum possible revenue, then completely different results would be obtained, indistinguishable from the consumer's point of view from those entailed by monopoly.

### Cournot's price model

Cournot presents a mathematically correct analysis of the equilibrium condition corresponding to a certain logically consistent model of duopolist behaviour. However his model is not stated and is not particularly natural (Shapiro remarked that observed practice constituted a "natural objection to the Cournot quantity model"[9]), and "his words and the mathematics do not quite match".[10]

His model can be grasped more easily if we slightly embellish it. Suppose that there are two owners of mineral water springs, each able to produce unlimited quantities at zero price. Suppose that instead of selling water to the public they offer it to a middle man. Each proprietor notifies the middle man of the quantity he or she intends to produce. The middle man finds the market-clearing price, which is determined by the demand function F and the aggregate supply. He or she sells the water at this price, passing the proceeds back to the proprietors.

The consumer demand D for mineral water at price p is denoted by F(p); the inverse of F is written f and the market-clearing price is given by p=f(D), where D=D1+D2 and Di is the amount supplied by proprietor i.

Each proprietor is assumed to know the amount being supplied by his or her rival, and to adjust his or her own supply in the light of it to maximize his or her profits. The position of equilibrium is one in which neither proprietor is inclined to adjust the quantity supplied.

It needs mental contortions to imagine the same market behaviour arising without a middle man.

### Interpretative difficulties

A feature of Cournot's model is that a single price applies to both proprietors. He justified this assumption by saying that "dès lors le prix est nécessairement le même pour l'un et l'autre propriétaire".[11] de Bornier expands on this by saying that "the obvious conclusion that only a single price can exist at a given moment" follows from "an essential assumption concerning his model, [namely] product homogeneity".[12]

Later on Cournot writes that a proprietor can adjust his supply "en modifiant correctement le prix".[13] Again, this is nonsense: it is impossible for a single price to be simultaneously under the control of two suppliers. If there is a single price, then it must be determined by the market as a consequence of the proprietors' decisions on matters under their individual control.

Cournot's account threw his English translator (Nathaniel Bacon) so completely off-balance that his words were corrected to "properly adjusting his price".[14] Edgeworth regarded equality of price in Cournot as "a particular condition, not... abstractly necessary in cases of imperfect competition".[15] Jean Magnan de Bornier says that in Cournot's theory "each owner will use price as a variable to control quantity" without saying how one price can govern two quantities. A. J. Nichol claimed that Cournot's theory makes no sense unless "prices are directly determined by buyers".[16] Shapiro, perhaps in despair, remarked that "the actual process of price formation in Cournot's theory is somewhat mysterious".[9]

### Collusion

Cournot's duopolists are not true profit-maximizers. Either supplier could increase his or her profits by cutting out the middle man and cornering the market by marginally undercutting his or her rival; thus the middle man can be seen as a mechanism for restricting competition.

## Finding the Cournot duopoly equilibrium

### Example 1

Cournot's model of competition is typically presented for the case of a duopoly market structure; the following example provides a straightforward analysis of the Cournot model for the case of Duopoly. Therefore, suppose we have a market consisting of only two firms which we will call firm 1 and firm 2. For simplicity, we assume each firm faces the same marginal cost. That is, for a given firm i's output quantity, denoted qi where i∈{1,2}, firm i's cost of producing qi units of output is given by C(qi)=χqi, where χ is the marginal cost. This assumption tells us that both firms face the same cost-per-unit produced. Therefore, as each firm's profit is equal to its revenues minus costs, where revenue equals the number of units produced multiplied by the market price, we can denote the profit functions for firm 1 and firm 2 as follows:

Π1(Q)=p(Q)q1−χq1
Π2(Q)=p(Q)q2−χq2

In the above profit functions we have price as a function of total output which we denote as Q and for two firms we must have Q=q1+q2. For example's sake, let us assume that price (inverse demand function) is linear and of the form p=a−bQ. So, the inverse demand function can then be rewritten as p=a−bq1−bq2.

Now, substituting our equation for price in place of p(Q) we can write each firm's profit function as:

Π1(q1,q2)=(a−bq1−bq2−χ)q1
Π2(q1,q2)=(a−bq1−bq2−χ)q2

As firms are assumed to be profit-maximizers, the first-order conditions (F.O.C.s) for each firm are:

∂Π1(q1,q2)∂q1=a−2bq1−bq2−χ=0
∂Π2(q1,q2)∂q2=a−bq1−2bq2−χ=0

The F.O.C.s state that firm i is producing at the profit-maximizing level of output when the marginal cost (MC) is equal to the marginal revenue (MR). Intuitively, this suggests that firms will produce up to the point where it remains profitable to do so, as any further production past this point will mean that MC>MR, and therefore production beyond this point results in the firm losing money for each additional unit produced. Notice that at the profit-maximizing quantity where MC=MR, we must have MC−MR=0 which is why we set the above equations equal to zero.

Now that we have two equations describing the states at which each firm is producing at the profit-maximizing quantity, we can simply solve this system of equations to obtain each firm's optimal level of output, q1,q2 for firms 1 and 2 respectively. So, we obtain:

q1=a−χ2b−q22
q2=a−χ2b−q12

These functions describe each firm's optimal (profit-maximizing) quantity of output given the price firms face in the market, p, the marginal cost, χ, and output quantity of rival firms. The functions can be thought of as describing a firm's "Best Response" to the other firm's level of output.

We can now find a Cournot-Nash Equilibrium using our "Best Response" functions above for the output quantity of firms 1 and 2. Recall that both firms face the same cost-per-unit (χ) and price (p). Therefore, using this symmetrical relationship between firms we find the equilibrium quantity by fixing q1=q2=q*. We can be sure this setup gives us the equilibrium levels as neither firm has an incentive to change their level of output as doing so will harm the firm at the benefit of their rival. Now substituting in q* for q1,q2 and solving we obtain the symmetric (same for each firm) output quantity in Equilibrium as q*=a−χ3b.

This equilibrium value describes the optimal level of output for firms 1 and 2, where each firm is producing an output quantity of q*. So, at equilibrium, the total market output Q will be Q=q1*+q2*=2(a−χ)3b.

### Example 2

The revenues accruing to the two proprietors are pD1 and pD2, i.e., f(D1+D2)⋅D1 and f(D1+D2)⋅D2. The first proprietor maximizes profit by optimizing over the parameterD1 under his control, giving the condition that the partial derivative of his profit with respect to D1 should be 0, and the mirror-image reasoning applies to his or her rival. We thus get the equations:

f(D1+D2)+D1f′(D1+D2)=0 and
f(D1+D2)+D2f′(D1+D2)=0.

The equlibirum position is found by solving these two equations simultaneously. This is most easily done by adding and subtracting them, turning them into:

D1=D2 and
2f(D)+Df′(D)=0, where D=D1+D2.

Thus, we see that the two proprietors supply equal quantities, and that the total quantity sold is the root of a single nonlinear equation in D.

Cournot goes further than this simple solution, investigating the stability of the equilibrium. Each of his original equations defines a relation between

and

which may be drawn on a graph. If the first proprietor was providing quantity

, then the second proprietor would adopt quantity

from the red curve to maximize his or her revenue. But then, by similar reasoning, the first proprietor will adjust his supply to

xll

to give him or her the maximum return as shown by the blue curve when

is equal to

. This will lead to the second proprietor adapting to the supply value

yll

, and so forth until equilibrium is reached at the point of intersection

, whose coordinates are

(x,y)

Since proprietors move towards the equilibrium position it follows that the equilibrium is stable, but Cournot remarks that if the red and blue curves were interchanged then this would cease to be true. He adds that it is easy to see that the corresponding diagram would be inadmissible since, for instance, it is necessarily the case that m1>m2. To verify this, notice that when D1 is 0, the two equations reduce to:

f(D2)=0 and
f(D2)+D2f′(D2)=0.

The first of these corresponds to the quantity D2 sold when the price is zero (which is the maximum quantity the public is willing to consume), while the second states that the derivative of D2f(D2) with respect to D2 is 0, but D2f(D2) is the monetary value of an aggregate sales quantity D2, and the turning point of this value is a maximum. Evidently, the sales quantity which maximizes monetary value is reached before the maximum possible sales quantity (which corresponds to a value of 0). So, the root m1 of the first equation is necessarily greater than the root m2 of the second equation.

### Comparison with monopoly

We have seen that Cournot's system reduces to the equation 2f(D)+Df′(D)=0. D is functionally related to p via f in one direction and F in the other. If we re-express this equation in terms of p, it tells us that F(p)+2pF′(p)=0, which can be compared with the equation F(p)+pF′(p)=0 obtained earlier for monopoly.

If we plot another variable

against

, then we may draw a curve of the function

u=−F(p)F′(p)

. The monopoly price is the

for which this curve intersects the line

u=p

, while the duopoly price is given by the intersection of the curve with the steeper line

u=2p

. Regardless of the shape of the curve, its intersection with

u=2p

occurs to the left of (i.e., at a lower price than) its intersection with

u=p

. Hence, prices are lower under duopoly than under monopoly, and quantities sold are accordingly higher.

### Extension to oligopoly

When there are n proprietors, the price equation becomes F(p)+npF′(p)=0. The price can be read from the diagram from the intersection of u=np with the curve. Hence, the price diminishes indefinitely as the number of proprietors increases. With an infinite number of proprietors, the price becomes zero; or more generally, if we allow for costs of production, the price becomes the marginal cost.

## Bertrand's critique

The French mathematician Joseph Bertrand, when reviewing Walras's Théorie Mathématique de la Richesse Sociale, was drawn to Cournot's book by Walras's high praise of it. Bertrand was critical of Cournot's reasoning and assumptions, Bertrand claimed that "removing the symbols would reduce the book to just a few pages".[17][note 1] His summary of Cournot's theory of duopoly has remained influential:

> Cournot assumes that one of the proprietors will reduce his price to attract buyers to him, and that the other will in turn reduce his price even more to attract buyers back to him. They will only stop undercutting each other in this way, when either proprietor, even if the other abandoned the struggle, has nothing more to gain from reducing his price. One major objection to this is that there is no solution under this assumption, in that there is no limit to the downward movement... If Cournot's formulation conceals this obvious result, it is because he most inadvertently introduces as D and D' the two proprietors' respective outputs, and by considering them as independent variables, he assumes that should either proprietor change his output then the other proprietor's output could remain constant. It quite obviously could not.

Pareto was unimpressed by Bertrand's critique, concluding from it that Bertrand 'wrote his article without consulting the books he criticised'.[18]

Irving Fisher outlined a model of duopoly similar to the one Bertrand had accused Cournot of analysing incorrectly:

> A more natural hypothesis, and one often tacitly adopted, is that each [producer] assumes his rival's price will remain fixed, while his own price is adjusted. Under this hypothesis each would undersell the other as long as any profit remained, so that the final result would be identical with the result of unlimited competition.[19]

Fisher seemed to regard Bertrand as having been the first to present this model, and it has since entered the literature as Bertrand competition.

## See also

* Aggregative game
* Bertrand competition
* Bertrand–Edgeworth model
* Conjectural variation
* Game theory
* Hotelling's linear city model
* Nash equilibrium
* Stackelberg competition
* Tacit collusion

## Notes

1. ↑ Bertrand's review is most easily found in Margaret Chevaillier's English translation appended to de Bornier 1992.

## References

1. ↑ 1.0 1.1 Varian, Hal R. (2006). Intermediate Microeconomics: A Modern Approach (Seventh ed.). W. W. Norton & Company. p. 490. ISBN 0393927024. https://books.google.com/books?id=EA1iQgAACAAJ.
2. ↑ Cournot, Antoine Augustin (1897). Recherches sur les Principes Mathématiques de la Théorie des Richesses. Economic classics. New York City: The Macmillan Company. https://books.google.com/books?id=eGgPAAAAYAAJ. Retrieved December 13, 2022.
3. ↑ Van den Berg, Anita; Bos, Iwan; Herings, P. Jean-Jacques; Peters, Hans (2012). "Dynamic Cournot duopoly with intertemporal capacity constraints". International Journal of Industrial Organization (Elsevier) 30 (2): 174–192. doi:10.1016/j.ijindorg.2011.08.002. https://cris.maastrichtuniversity.nl/ws/files/64767873/Herings_2012_dynamic_cournot_duopoly_with_intertemporal.pdf. Retrieved January 22, 2023.
4. ↑ 4.0 4.1 4.2 4.3 Morrison, Clarence C. (1998). "Cournot, bertrand, and modern game theory". Atlantic Economic Journal (Springer) 26 (2): 172–174. doi:10.1007/BF02299359.
5. ↑ Fisher, Irving (1898). "Cournot and mathematical economics". The Quarterly Journal of Economics (Oxford University Press) 12 (2): 119–138. doi:10.2307/1882115. , cited by Friedman 2000.
6. ↑ 6.0 6.1 Friedman, James W. (2000). "The legacy of Augustin Cournot". Cahiers d'économie politique 37 (1): 31–46. doi:10.3406/cep.2000.1287. https://www.persee.fr/doc/cep_0154-8344_2000_num_37_1_1287. Retrieved December 13, 2022.
7. ↑ Robert, Paul; Rey-Debove, Josette; Rey, Alain, eds (2000) (in fr). Le Petit Robert. Dictionnaires Le Robert. ISBN 2-85036-668-4. "débit1" .
8. ↑ Cournot 1897, p. 49.
9. ↑ 9.0 9.1 Shapiro, Carl (1989). "Theories of oligopoly behavior". Handbook of Industrial Organization (Elsevier) 1: 329–414. doi:10.1016/S1573-448X(89)01009-5. , quoted by de Bornier 1992.
10. ↑ Shubik, Martin (1959). Strategy and Market Structure: Competition, Oligopoly, and the Theory of Games. New York City , N.Y.: John Wiley & Sons. , quoted by de Bornier 1992.
11. ↑ Cournot 1897: "thus the price is necessarily the same for both proprietors".
12. ↑ de Bornier, Jean Magnan (1992). "The "Cournot-Bertrand Debate": A Historical Perspective". History of Political Economy (Duke University Press) 24 (3): 623–656. doi:10.1215/00182702-24-3-623. https://competitionandappropriation.econ.ucla.edu/wp-content/uploads/sites/95/2020/12/CournotBertrand-debate.pdf. Retrieved December 13, 2022.
13. ↑ Cournot 1897: "by appropriately modifying the price".
14. ↑ Cournot 1897, quoted by de Bornier 1992.
15. ↑ Edgeworth, F. Y. (1881). Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciences. London: C. Kegan Paul & Co.. https://socialsciences.mcmaster.ca/econ/ugcm/3ll3/edgeworth/mathpsychics.pdf. Retrieved December 13, 2022. , quoted in Friedman 2000.
16. ↑ Nichol, Archibald J. (1934). "A Re-Appraisal of Cournot's Theory of Duopoly Price". Journal of Political Economy (The University of Chicago Press) 42 (1): 80–105. doi:10.1086/254576. , quoted by de Bornier 1992.
17. ↑ de Bornier 1992, p. 631.
18. ↑ Pareto, Vilfredo (1911). "Économie mathématique". in Molk, Jules (in fr). Encyclopédie des sciences mathématiques pures et appliquées. Tome I, Vol. 4, Fascicle 4, Chapter I-26. Translated from German edition. Paris: Gauthier-Villars. pp. 591–640. https://www.gabay-editeur.com/MOLK-ENCYCLOPEDIE-DES-SCIENCES-MATHEMATIQUES-t-I-vol-4-Calcul-des-probabilites-1906-1911. Retrieved December 13, 2022. "il a rédigé son article sans avoir sous les yeux les livres des auteurs qu'il critiquait". , cited by de Bornier 1992.
19. ↑ Fisher 1898, cited by de Bornier 1992.

## Further reading

* Holt, Charles. Games and Strategic Behavior (PDF version), PDF
* Tirole, Jean. The Theory of Industrial Organization, MIT Press, 1988.
* Oligoply Theory made Simple, Chapter 6 of Surfing Economics by Huw Dixon.
* Shumpeter, Joseph, History of Economic Analysis (1954). Discusses Cournot at length.

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