English unjust enrichment lawThe English law of unjust enrichment is part of the English law of obligations, along with the law of contract, tort, and trusts. The law of unjust enrichment deals with circumstances in which one person is required to make restitution of a benefit acquired at the expense of another in circumstances which are unjust. The modern law of unjust enrichment encompasses what was once known as the law of quasi-contract. Its precise scope remains a matter of controversy.
AssumpsitAssumpsit ("he has undertaken", from Latin, assumere), or more fully, action in assumpsit, was a form of action at common law used to enforce what are now called obligations arising in tort and contract; and in some common law jurisdictions, unjust enrichment. The origins of the action can be traced to the 14th century, when litigants seeking justice in the royal courts turned from the writs of covenant and debt to the trespass on the case. In the early days of the English common law, agreements were enforced in local courts.
Form of actionThe forms of action were the different procedures by which a legal claim could be made during much of the history of the English common law. Depending on the court, a plaintiff would purchase a writ in Chancery (or file a bill) which would set in motion a series of events eventually leading to a trial in one of the medieval common law courts. Each writ entailed a different set of procedures and remedies which together amounted to the "form of action". The forms of action were abolished during the 19th century, but they have left an indelible mark on the law.
Quasi-contrat en droit civil françaisSelon l'article du code civil français : les quasi-contrats sont des faits purement volontaires dont il résulte un engagement de celui qui en profite sans y avoir droit, et parfois un engagement de leur auteur envers autrui. Le quasi-contrat est donc un fait licite et volontaire, qui fait naître, du seul fait de la loi, certaines obligations juridiques particulières. Il correspond à la situation dans laquelle, en dehors de tout contrat, une obligation juridique semblable à une obligation contractuelle naît.
Enrichissement sans causeEn droit civil, l'institution de lenrichissement sans cause (aussi appelé enrichissement illégitime, enrichissement injustifié ou action de in rem verso ), consiste à permettre à une personne qui se sera acquittée sans raison d'une obligation, et qui se sera donc appauvrie, de demander à être remboursée par celui qui s'est enrichi à son détriment. Ainsi, nul ne peut s'enrichir aux dépens d'autrui. Enrichissement sans cause en droit français La notion d'enrichissement sans cause a été reconnue par la Cour de cassation en 1892.
