Consideration
The bargained-for exchange of legal value that makes a promise enforceable.
Consideration requires both a bargained-for exchange and legal detriment (doing something one is not obligated to do, or forbearing something one is entitled to do). Where consideration is absent, promissory estoppel may still enforce a promise that the promisor should expect to induce reliance, and that does induce detrimental reliance, if injustice can be avoided only by enforcement.
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