Unjust enrichment

Short description: Legal concept

In laws of equity, unjust enrichment occurs when one person is enriched at the expense of another in circumstances that the law sees as unjust.[1] Where an individual is unjustly enriched, the law imposes an obligation upon the recipient to make restitution, subject to defences such as change of position. Liability for an unjust (or unjustified) enrichment arises irrespective of wrongdoing on the part of the recipient. The concept of unjust enrichment can be traced to Roman law and the maxim that "no one should be benefited at another's expense": nemo locupletari potest aliena iactura or nemo locupletari debet cum aliena iactura.

The law of unjust enrichment is closely related to, but not co-extensive with, the law of restitution. The law of restitution is the law of gain-based recovery. It is wider than the law of unjust enrichment. Restitution for unjust enrichment is a subset of the law of restitution in the same way that compensation for breach of contract is a subset of the law relating to compensation.

Unjust enrichment is not to be confused with illicit enrichment, which is a legal concept referring to the enjoyment of an amount of wealth by a person that is not justified by reference to their lawful income.

## Contents

* 1 History
* 1.1 Roman law
* 1.2 Civil law
* 1.3 Common law
* 2 Framework
* 2.1 The meaning of unjust: unjust factors vs. absence of basis
* 2.2 Remedies for unjust enrichment: personal and proprietary restitution
* 3 National systems
* 3.1 Australia
* 3.2 Belgium
* 3.3 United Kingdom
* 3.4 United States
* 3.5 Canada
* 4 See also
* 5 Notes
* 6 References

## History

### Roman law

In civil law systems, unjust enrichment is often referred to as unjustified enrichment. Its historical foundation of enrichment without cause can be traced back to the Corpus Iuris Civilis.[2] While the concept of enrichment without cause was unknown in classical Roman law,[3] Roman legal compilers eventually enunciated the principle of unjustified enrichment based on two actions of the classical Roman period—the condictio and the actio de in rem verso.[2]

The condictio authorized recovery by the plaintiff of a certain object or money in the hands of the defendant. The defendant was considered a borrower who was charged with returning the object or money.[4] For the actio de in rem verso, the plaintiff bore the burden of specifying the cause for his demand, namely, demanding the restitution of assets that had exited the plaintiff's patrimony and entered the defendant’s patrimony through the acts of the defendant’s servants.[5]

The coherent concept of unjustified enrichment then appeared in the Justinian Code, based on Roman pragmatism with equitable considerations and moral principles of Greek philosophy.[2] In the Justinian Code, condictiones were grouped into categories, such as when the plaintiff had given a thing or money:[2]

1. in contemplation of a future result that did not follow;
2. for a reason disapproved by law or repugnant to public policy;
3. by mistake because payment was not actually due; or
4. without a good reason for the transaction.

Further, the actio de in rem verso gradually expanded to cover instances in which third parties were enriched at the expense of the impoverished obligee, and unjustified enrichment was recognized as a source of obligations under the heading of "quasi-contract".[2]

### Civil law

The interpretations of Roman law principles on unjustified enrichment, by the French Jurist Jean Domat, and the German jurist Friedrich Carl von Savigny, formed the respective origins of the modern French and German law on unjustified enrichment.[6] Domat developed the French unjustified enrichment principles based on the actio de in rem verso, as well as a modified version of the Roman concept of causa (cause), which renders contracts actionable even when they are not normally recognized under Roman law.[2] In contrast, the concept of unjustified enrichment is considerably broader and more frequently invoked in Germany and Greece to address issues of restitution as well as restoration for failed juridical acts.[7] Equitable tracing is a particularly well suited remedial tool.

### Common law

See also: English unjust enrichment law

In systems of law derived from the English common law, the historical core of the law of unjust enrichment lies in quasi-contract. These were common law (as distinct from equitable) claims giving rise to a personal liability to pay the money value of a benefit received from another. Legal scholars from Oxford, Cambridge and Harvard at the turn of the 20th century began to rationalise these disparate actions into a coherent body of law.[8] The principle said to underlie these actions was eventually recognized as unjust enrichment.[9] Subsequent scholarship has sought to expand the explanatory power of the principle of unjust enrichment and it is now often said (albeit not without controversy)[10] to encompass both common law and equitable claims.[11]

## Framework

Contract law

Part of the common law series
Contract formation

* Offer and acceptance
* Posting rule
* Mirror image rule
* Invitation to treat
* Firm offer
* Consideration
* Implication-in-fact
* Collateral contract

Defenses against formation

* Lack of capacity
* Duress
* Undue influence
* Illusory promise
* Statute of frauds
* Non est factum

Contract interpretation

* Parol evidence rule
* Contract of adhesion
* Integration clause
* Contra proferentem

Excuses for non-performance

* Mistake
* Misrepresentation
* Frustration of purpose
* Impossibility
* Impracticability
* Illegality
* Unclean hands
* Unconscionability
* Accord and satisfaction

Rights of third parties

* Privity of contract
* Assignment
* Delegation
* Novation
* Third-party beneficiary

Breach of contract

* Anticipatory repudiation
* Cover
* Exclusion clause
* Efficient breach
* Deviation
* Fundamental breach

Remedies

* Specific performance
* Liquidated damages
* Penal damages
* Rescission

Quasi-contractual obligations

* Promissory estoppel
* Quantum meruit
* Unjust enrichment

Related areas of law

* Conflict of laws
* Commercial law

Other common law areas

* Tort law
* Property law
* Wills, trusts, and estates
* Criminal law
* Evidence

* v
* t
* e

Cases of unjust (or unjustified) enrichment can be examined in the following way:

* Was the defendant enriched?
* Was the enrichment at the expense of the claimant?
* Was the enrichment unjust?
* Does the defendant have a defense?
* What remedies are available to the claimant?

These questions are a familiar part of the modern English law of unjust enrichment, having been popularised by the writing of Professor Peter Birks and expressly endorsed by English courts.[12][13] The framework provides a useful taxonomical function in Australian law,[14] though the concept of unjust enrichment has been subject to inconsistent treatment by Australian courts, as discussed below. Stated at this level of abstraction, the framework is a useful grounding for comparative study between common law and civil law jurisdictions.

### The meaning of unjust: unjust factors vs. absence of basis

Generally speaking, the mere receipt of a benefit from another is unobjectionable and does not attract legal consequences. The exception is where such receipt is "unjust" or "unjustified". Both civil and common law legal systems have bodies of law providing remedies to reverse such enrichment.

A conceptual split, albeit one not necessarily coextensive with the common law - civil distinction, is between systems based on an "unjust factor" approach and systems based on an "absence of basis" approach.

* Common law systems such as those of England, Australia, Canada and the United States typically adopt the "unjust factor" approach. In this analysis, the claimant must point to a positive reason why the defendant's enrichment is unjust. Examples of "unjust factors" that ground a claim for restitution include: mistakes of fact or law; total failure of consideration, duress, undue influence, and the Woolwich ground.
* Civil law systems such as those of France and Germany typically adopt an "absence of basis" approach. On this analysis, the defendant is obliged to make restitution if there is no "basis" for his receipt: for example, because the contract under which the defendant received the benefit was void ab initio. Some common law systems have shown signs of a possible shift towards this approach.[15]

In most cases, the conceptual approach does not affect the outcome of a case. For example, suppose that A makes an oral contract with B under which A will pay $100 for certain services to be provided by B. Further suppose that A pays the money but B discovers that, pursuant to legislation, contracts for such services are void unless in writing. B refuses to perform. Can A recover his payment? On both approaches, B is unjustly enriched at A's expense. On the "absence of basis" approach, B's enrichment has no legitimate explanatory basis because the contract was void. On the "unjust factor" approach, there has been a total failure of consideration - that is, A has received no part of the bargained-for counter-performance; restitution follows automatically from the fact of invalidity.

### Remedies for unjust enrichment: personal and proprietary restitution

The remedy for unjust enrichment is restitution: the restoration of what was conferred to the claimant. In short, the correcting of the injustice that occurred when the claimant suffered a subtraction of wealth and the defendant received corresponding benefit.[16] Restitution can take the form of a personal or a proprietary remedy.

Where a personal remedy is awarded, the defendant is ordered to pay the money value of the benefit received. This personal money award is the typical form of restitution ordered.

Where a proprietary remedy is awarded, the court recognises (or declares) that the defendant has a beneficial or security interest in specific property of the defendant. Whether proprietary remedies can be awarded depends on the jurisdiction in question.

* In English law, the orthodox view is that unjust enrichment generally triggers personal, rather than proprietary remedies.[17] This is because the law of quasi-contract only generate personal money awards: either a liquidated debt (as in actions for money had and received or money paid) or a sum assessed by a civil jury or the court itself (as in quantum meruit or quantum valebat). Scholars seeking to expand the explanatory power of unjust enrichment have argued that other areas of the law such as subrogation and claims to traceable substitutes form part of the law of unjust enrichment. This view has been accepted, though its implications remain unclear.
* In Australian law, actions derived from the common money counts continue to generate only personal remedies. The doctrinal basis of subrogation is not unsettled: it has nothing to do with unjust enrichment.[18] Claims to traceable substitutes are a part of the law of property, not unjust enrichment.

## National systems

### Australia

Whether there is a distinct body of law in Australia known as the law of unjust enrichment is a highly controversial question. In Pavey & Mathews v Paul (1987) 162 CLR 221 the concept of unjust enrichment was expressly endorsed by the High Court of Australia. This was subsequently followed in numerous first instance and appellate decisions, as well as by the High Court itself.

Considerable skepticism about the utility of the concept of unjust enrichment has been expressed in recent years. The equitable basis for the action for money had and received has instead been emphasised and in Australian Financial v Hills [2014] HCA 14 the plurality held that the concept of unjust enrichment was effectively 'inconsistent' with the law of restitution as it had developed in Australia. It is worth noting that the analytic framework had been expressly endorsed by the High Court just two years before in Equuscorp v Haxton [2012] HCA 7. For the moment, the concept of unjust enrichment appears to serve only a taxonomical function.[19]

### Belgium

The reception of unjust enrichment into Belgian law has been upheld multiple times by the Court of Cassation, which has ruled that unjust enrichment is a general principle of law.[20][21][22] The Court has stated that the legal basis for unjust enrichment is equity (ius aequum).

According to the Court, five elements constitute unjust enrichment:

1. an enrichment;
2. an impoverishment;
3. a connection between the enrichment and the impoverishment;
4. an absence of a basis (sine causa) of the enrichment;
5. a person alleging unjust enrichment may not simultaneously do so for benevolent intervention (negotiorum gestio) or undue payment (solutio indebiti).

### United Kingdom

The law of unjust enrichment in England rapidly developed during the second half of the 20th century. It has been heavily influenced by the writings of jurists from Oxford and Cambridge.[23] England adopts the "unjust factor" approach.

In Scotland, the law developed in a piecemeal fashion through the twentieth century, culminating in three pivotal cases in the late 1990s. The most crucial of these was Shilliday v Smith, in which Lord Roger essentially laid the bedrock for what is now considered modern Scots unjustified enrichment law, bringing together the fragmented law into one framework, drawing from the principles of Roman Law upon which Scots Law as a whole is based (note the term "unjustified" is preferred to "unjust" in Scotland). Unjustified enrichment is more established as a fundamental part of the Scots law of obligations than unjust enrichment is in English law.[24]

### United States

The Restatement (Third) of Restitution and Unjust Enrichment (2011) (“R3RUE”) states that unjust enrichment is a body of legal obligations under the common law and equity — but separate from tort and contract law — that is available to take away an enrichment that lacks an adequate legal basis. A claim of restitution for unjust enrichment “results from a transaction that the law treats as ineffective to work a conclusive alteration in ownership rights.”[25][26]

The Third Restatement and its predecessor, the Restatement on Restitution (1937),[lower-alpha 1] advocate for treating restitution as a unified and cohesive body of law, rather than a muddled variety of miscellaneous legal and equitable claims, remedies, and doctrines such as quantum meruit, quantum valebant, account of profits, quasi-contract, constructive trust, money had and received, and so forth.

Because the common law is mostly governed by state law, especially after Erie Railroad Co. v. Tompkins (1938), restitution is mostly determined by the law of each state and territory. However, it can also be a remedy under federal law.

Federal patent and copyright law has long allowed recovery for either damages or profits. In Livingston v. Woodworth, 56 U.S. 546 (1854), the Supreme Court held that a patent-owner could sue in equity for an infringer’s profits, saying that the ill-gotten profits belonged “ex aequo et bono” to the owner of the patent. (This mirrored the landmark English ruling of Lord Mansfield in Moses v Macferlan (K.B. 1760) that a plaintiff may sue “for money which, ex aequo et bono, the defendant ought to refund” — whether suing in law or in equity.) Later, recovery for either damages or profits was codified in statute. The Supreme Court identified recovery of profits under the Copyright Act as a form of equitable relief for “unjust enrichment” in Sheldon v. Metro-Goldwyn Pictures Corp. (1940).

In Kansas v. Nebraska, 574 U.S. 445 (2015), the Supreme Court ordered restitution by Nebraska as an equitable remedy for breach of an interstate water-sharing agreement with Kansas. The majority cited the Third Restatement to support the availability of restitution for “opportunistic breach” of contract.

In Liu v. Securities and Exchange Commission (2020), the Supreme Court held that restitution (usually called “disgorgement” in U.S. securities law) is available for violations of federal securities law, because the SEC is authorized to seek “equitable relief” under 15 U.S.C. § 78u(d)(5).

In AMG Capital Management, LLC v. FTC (2021), the Supreme Court held that statutory authority for the Federal Trade Commission to sue for an “injunction” does not authorize suit for restitution. The court unanimously held that the statutory language refers to prospective equitable relief, and does not include retrospective monetary relief.

### Canada

The doctrine of unjust enrichment was definitively established as a fully fledged course of action in Canada in Pettkus v. Becker, 1980 CanLII 22 (SCC), [1980] 2 SCR 834 [27]

To establish unjust enrichment, the Plaintiff needs to show: (i) enrichment; (ii) deprivation; (iii) causal connection between enrichment and deprivation; and (iv) absence of juristic justification for the enrichment.[27]

The concept of deprivation and enrichment are extremely broad. Deprivation refers to any loss of money or money's worth in the form of contribution while A is enriched if B contributes to the acquisition of assets in A's name.[27] The causal connection between enrichment and deprivation must be "substantial and direct".[27] The absence of juristic reason is satisfied if a Plaintiff establishes a reason why the benefit ought not be retained, or if the Defendant demonstrates a convincing argument in favour of retention of the property.[27] Remedy for unjust enrichment is frequently an imposition of constructive trust over the property unjustly retained.[27]

## See also

* Rent-seeking
* Law of restitution
* Quasi-contract
* Other parts of the law of obligations:
* Law of contract
* Law of tort
* Law of trusts
* Leading scholars on the English law of unjust enrichment;
* Robert Goff, Baron Goff of Chieveley
* Professor Gareth Jones
* Professor Peter Birks
* Professor Andrew Burrows
* Professor Graham Virgo
* Professor Charles Mitchell

## Notes

1. ↑ The American Law Institute did not publish a new volume on restitution during its second series of restatements. As such, there is no “Second Restatement on Restitution.”

## References

1. ↑ See generally: Mitchell et al, Goff & Jones Law of Unjust Enrichment (Sweet & Maxwell, 8th ed, 2011); Graham Virgo, The Principles of the Law of Restitution (3rd ed, 2015); Andrew Burrows, The Law of Restitution (3rd ed, 2011); Mason, Carter, and Tolhurst, Mason & Carter's Restitution Law in Australia (LexisNexis, 2nd ed, 2008). On unjust enrichment as a 'unifying legal concept', see the judgment of Deane J in Pavey & Mathews v Paul (1987) 162 CLR 221.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Davrados, Nikolaos (2018). "Demystifying Enrichment Without Cause". Louisiana Law Review 78. https://digitalcommons.law.lsu.edu/cgi/viewcontent.cgi?article=6696&context=lalrev.
3. ↑ Michael Stathopoulos, Axiosis Adikaiologitou Ploutismou [Claim of Unjustified Enrichment] 2 (1972).
4. ↑ See MAX KASER, DAS ALTRÖMISCHE JUS 286–88 (1949).
5. ↑ Zimmermann, Reinhard (1990). The Law of Obligations: Roman Foundations of the Civilian Tradition. pp. 878–884.
6. ↑ See Christos Filios, H Aitia Stis Enochikes Symvaseis [The Causa Contrahendi] 30, 101–25 (2007) (Greece).
7. ↑ See 1 Max Kaser, Das Römische Privatrecht § 139.3 (2d ed. 1971).
8. ↑ See generally: Baker, An Introduction to English Legal History (4th edition); Graham Virgo, The Principles of the Law of Restitution (3rd ed, 2015); Andrew Burrows, The Law of Restitution (3rd ed, 2011).
9. ↑ See, e.g., Pavey & Mathews v Paul [1987] (Australia); Lipkin Gorman v Karpnale [1991] (England).
10. ↑ See, e.g., Bofinger v Kingsway [2009] 239 CLR 269
11. ↑ See, e.g., Mitchell and Watterson, Subrogation: Law and Practice (2nd Edition).
12. ↑ See, e.g., Bank of Cyprus v Menelou [2015] UKSC 66
13. ↑ Birks, Peter (2005). Unjust enrichment (2nd ed.). Oxford: Oxford University Press. ISBN 0-19-927697-8.
14. ↑ See Lampson v Fortescue Metals (No 3) [2014] WASC 162 (Edelman J).
15. ↑ See, e.g., Deutsche Morgan Grenfell v IRC [2007] 1 AC 558
16. ↑ Note that it remains a controversial point, at least in English law, whether there is a distinct "correspondence principle". See generally, Virgo, Principles of the Law of Restitution (3rd ed, 2015); Burrows, Law of Restitution (3rd ed, 2010).
17. ↑ But see Bank of Cyprus v Menelaou [2015] UKSC 66
18. ↑ Bofinger v Kingsway [2009] HCA 44
19. ↑ Equuscorp v Haxton [2012] HCA 7; Lampson v Fortescue Metals (No 3) [2014] WASC 162 (Edelman J).
20. ↑ Cass. 17 November 1983, RW 1983-84, 2982.
21. ↑ Cass. 7 September 2001, Cah.dr.immo 2002, 18.
22. ↑ Cass. 19 January 2009, RCJB 2012, 69.
23. ↑ See, e.g., Commerzbank v Gareth Price-Jones [2004] EWCA Civ 1663 at [47] (Mummery LJ).
24. ↑ "Shaping the law of unjust enrichment" (in en). 2015-08-25. https://www.law.ox.ac.uk/research-subject-groups/research-index/impact-index/shaping-law-unjust-enrichment.
25. ↑ Restatement (Third) of Restitution and Unjust Enrichment, §1, comment b (Discussion Draft 2000)
26. ↑ "The Intellectual History of Unjust Enrichment" (in en-US). https://harvardlawreview.org/2020/04/the-intellectual-history-of-unjust-enrichment/.
27. ↑ 27.0 27.1 27.2 27.3 27.4 27.5 ,scrollChunk:!n,searchQuery:'unjust enrichment in canada',searchSortBy:RELEVANCE,tab:search)) "The Emergence of Unjust Enrichment as a Cause of Action and the Remedy of Constructive Trust, 1988 CanLIIDocs 93". Alberta Law Review. https://commentary.canlii.org/w/canlii/1988CanLIIDocs93?zoupio-debug#!fragment/zoupio-_Toc3Page4/(hash:(chunk:(anchorText:zoupio-_Toc3Page4),notesQuery:,scrollChunk:!n,searchQuery:'unjust enrichment in canada',searchSortBy:RELEVANCE,tab:search)).

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