A clear and unequivocal promise intended to be acted upon, and which is acted upon, may be enforced in equity by way of promissory estoppel even without consideration.
Contract — Consideration and Estoppel
Promissory estoppel cannot found a cause of action as a sword where no pre-existing contractual relationship or obligation otherwise exists.
Practical benefit obtained by a promisor from a promisee's performance of an existing contractual duty can constitute good consideration for a promise of additional payment.
Performance of a pre-existing contractual duty owed to the promisor cannot constitute good consideration for a new promise.
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