A quasi-contract (implied in law) is—unlike both express and implied contracts, which embody an actual agreement of the parties—an obligation said to be “imposed by law” in order to avoid unjust enrichment of one person at the expense of another. A quasi-contract is not a contract at all; it is a fiction that the courts created to prevent injustice. Suppose, for example, that the local lumberyard mistakenly delivers a load of lumber to your house, where you are repairing your deck. It was a neighbor on the next block who ordered the lumber, but you are happy to accept the load for free; since you never talked to the lumberyard, you figure you need not pay the bill. Although it is true there is no contract, the law implies a contract for the value of the material: of course you will have to pay for what you got and took. The existence of this implied contract does not depend on the intention of the parties.
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