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“Quasi-Contracts” is a category for books that examine obligations the law imposes without an actual agreement, to prevent unjust enrichment—often discussed under restitution, unjust enrichment, or contracts implied in law. Works typically span doctrinal treatises, casebooks, and practice guides, covering foundations in Roman law and civil law “quasi-contractus,” common-law development, and comparative perspectives. Core topics include elements and defenses of unjust enrichment, valuation of benefits, and remedies such as restitution, quantum meruit, money had and received, and constructive trusts, as well as the distinction between obligations implied in law and implied in fact. Many titles also explore policy and theory in equity, economics, and moral philosophy, with applications to mistaken payments, benefits conferred without agreement, unenforceable or void contracts, emergency services, fiduciary breaches, and wrongful takings. The category serves students, scholars, and practitioners seeking both analytic frameworks and practical strategies.

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