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.
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. The Court has stated that the legal basis for unjust enrichment is
equity (
ius aequum). According to the Court, five elements constitute unjust enrichment: • an enrichment; • an impoverishment; • a connection between the enrichment and the impoverishment; • an absence of a basis (
sine causa) of the enrichment; • a person alleging unjust enrichment may not simultaneously do so for benevolent intervention (
negotiorum gestio) or undue payment (
solutio indebiti).
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] 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. 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.
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.” The Third Restatement and its predecessor, the
Restatement on Restitution (1937), 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. Also in 1938, the enactment of the
Federal Rules of Civil Procedure merged procedures for law and equity and replaced the common-law
forms of action with a single civil action. This has, to some extent, blurred differences between legal and equitable restitution, and obscured awareness of legal restitution's origin in the action of
assumpsit.
Federal case law One early case in the Supreme Court,
Bingham v. Cabot (1795), was a suit at law for
money had and received,
quantum meruit, and
quantum valebant (three "common counts" for legal restitution). (The decision focused on other questions, including whether the case should have been brought in
admiralty and whether in deciding a
writ of error the court could take notice of certain facts.) In
Bright v. Boyd, 4 F. Cas. 127, 132-34 (C.C.D. Maine 1841), Justice
Joseph Story, a prominent early American jurist (and author of influential treatises on equity), held that recovery was available in
equity for mistaken improvements to land (i.e., when the person improving the land later learns that he did not own the land), citing the Latin maxim against enrichment at another's detriment. 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. 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
Trustees v. Greenough 105 U.S. 527 (1881), the Supreme Court held that, in a representative suit in equity (later known as a
class action), a representative plaintiff who recovers a "common fund" for the benefit of all represented plaintiffs (absent class members) may recover attorney fees from the fund, preventing enrichment of the absent plaintiffs at the expense of the representative plaintiff. This is an exception to the "
American rule" that litigants must pay their own attorney fees (absent statutory exceptions). In
Central Railroad & Banking Co. of Georgia v. Pettus (1885), the court held that the representative plaintiff could not, however, recover a salary for the time spent litigating. Restitution is available in equity to recover money previously paid to satisfy a court judgment that is later reversed, as the Supreme Court held in
Atlantic Coast Line R. Co. v. Florida, 295 U.S. 301 (1935). However, the Court therefore noted that equitable defenses are available where it would not be fair to require the money to be returned. In
Mobil Oil Exploration & Producing Southeast, Inc. v. United States, 530 US 604 (2000), the Supreme Court ruled that, in a contract with the United States (one of few areas where federal contract law applies), repudiation is grounds for restitution, even if the contract was repudiated by a statute. (Congress had blocked Mobil's offshore oil lease, so the United States had to return the money paid for the lease.) In
Great-West Life and Annuity Insurance Company v. Knudson, 534 U.S. 204 (2002), the Supreme Court noted that legal restitution and equitable restitution are not historically identical, and so it held that legal restitution is not covered by a provision of
ERISA authorizing only equitable relief. 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. In
Pearson v. Target Corp., 968 F.3d 827 (7th Cir. 2020), the
Seventh Circuit held that equitable restitution is available for a practice known as "objector blackmail," where objectors to a
class action settlement drop their objections on behalf of the class in return for a
private payment in excess of the rest of the class. In
Williams Electronics Games, Inc. v. Garrity, 366 F.3d 569 (7th Cir. 2004), Judge
Richard Posner held that restitution for wrongs is generally "available in any
intentional-tort case in which the tortfeasor has made a profit that exceeds the victim's damages." (The Third Restatement puts further qualifications, including that restitution for wrongs is not available where an
injunction to prevent the tort would have been inequitable.)
Books on American restitution • • • • • • ==See also==