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A quasi-contract (or implied-in-law contract or constructive contract) is a fictional contract created by courts for equitable, not contractual, purposes. A quasi-contract is not an actual contract, but is a legal substitute formed to impose equity between two parties. The concept of a quasi-contract is that of a contract that ''should'' have been formed, even though in actuality it was not. It is used when a court finds it appropriate to create an obligation upon a non-contracting party to ''avoid injustice'' and to ''ensure fairness''. It is invoked in circumstances of and is connected with the concept of restitution. Generally the existence of an actual or implied-in-fact contract is required for the defendant to be liable for services rendered, and a person who provides a service uninvited is an officious intermeddler who is not entitled to compensation. "Would-be plaintiffs cannot deliver unordered goods or services and demand payment for the benefit....A corollary is that one who ''does'' have an enforceable contract is bound by the contract's terms: subject to a few controversial exceptions, she cannot sue for restitution of the value of benefits conferred..." 〔Douglas Laycock, ''Modern American Remedies'', 3rd edition (2002) pg. 566〕 However, in many jurisdictions under certain circumstances plaintiffs may be entitled to restitution under quasi-contract (as in the example of Oklahoma below). They are used as remedies for unjust enrichment, management of another's affairs (''negotiorum gestio''), or payment of a thing not due (''indebiti solutio''). Quasi-contracts are defined to be "the lawful and purely voluntary acts of a man, from which there results any obligation whatever to a third person, and sometime a reciprocal obligation between the parties." The French Civil Code covers quasi-contracts in the 3rd Book, Title IV, Chapter 1 (articles 1371-1381).〔(Chapitre Ier : Des quasi-contrats ) ''Code civil'', Legifrance.gouv.fr. Retrieved 31 March 2013〕 One authority defines a quasi-contract as "A licit and voluntary act from which derives obligations subject to a regime close to the contractual one imposing on the author of the act and a third party, not-bound by a contract".〔"Quasi-contrat", ''Lexique des Termes Juridiques'', Dalloz, 2013, pg. 745〕 ==Contract compared== In contracts, it is the consent of the contracting parties which produces the obligation; in quasi-contracts no consent is required, and the obligation arises from the law or natural equity, on the facts of the case. These acts are called quasi-contracts, because, without being contracts, they bind the parties as contracts do. "A quasi-contract is not really a contract at all in the normal meaning of a contract," according to one scholar, but rather is "an obligation imposed on a party to make things fair." The Oklahoma Supreme Court has described the distinction between a contract and a quasi-contract in T & S Inv. Co. v. Coury, 593 P.2d 503 (Okla. 1979), as follows: ''quantum meruit'', for "as much as is deserved." For example, accountant prepares tax-payer's taxes, finding a way to get him an unusually large refund. Tax-payer doesn't pay accountant. Assuming a court finds no contract, tax-payer is only liable for the fair market value of tax preparation services, which is not inflated up to account for the unusually large refund he enjoyed. Under Oklahoma law: The party to be charged is any defendant, or in the case of a guarantee or surety, a co-defendant, in a breach of contract lawsuit. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quasi-contract」の詳細全文を読む スポンサード リンク
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