What type of contract is created by law to prevent unjust enrichment?

A quasi contract is a legal construct that is established by law to address situations where one party benefits at the expense of another, effectively preventing unjust enrichment. This type of contract does not arise from an agreement between the parties but is imposed by law to ensure fairness and justice in scenarios where one party is unjustly enriched by receiving a benefit without compensating the other party.

In essence, quasi contracts operate under the principle that even in the absence of a formal agreement, the law recognizes certain relationships that warrant compensation to the party suffering a loss or providing a benefit. This means when one party receives a benefit that they should not justly keep—such as services rendered or goods delivered—they may be required to compensate the other party for that benefit, reflecting an obligation that the law enforces.

Other types of contracts listed do not have the same focus on preventing unjust enrichment. Contingent contracts depend on uncertain future events, valid contracts are based on mutual agreement and all essential elements being present, and breach of contract refers to the violation of an agreed term of a contract, rather than the establishment of a contract itself. Thus, the correct identification of quasi contracts reflects their unique purpose in legal situations.