promissory estoppel

Promissory estoppel is a legal dotrine under which courts will enforce an agreement, even where consideration does not exist, when it is necessary to do so to avoid injustice.

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Under the doctrine of promissory estoppel, a party may recover on the basis of a promise made when the party's reliance on that promise was reasonable, and the party attempting to recover detrimentally relied on the promise. The legal requirements to demonstrate promissory estoppel differ from state to state.