Restatement Second of Contracts § 90

Promise Reasonably Inducing Action or Forbearance

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1. A promise which the promisor should reasonably expect to induce action or forbearance on the part of the promisee or a third person and which does induce such action or forbearance is binding if injustice can be avoided only by enforcement of the promise. The remedy granted for breach may be limited as justice requires.
2. A charitable subscription or a marriage settlement is binding under Subsection (1) without proof that the promise induced action or forbearance.