Study guide
Consideration, Bargained-for Exchange, and Promissory Estoppel
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Consideration, Bargained-for Exchange, and Promissory Estoppel
Key Takeaways Explain This Topic AI
Consideration requires a BARGAINED-FOR EXCHANGE of legal value: a promisee incurs a legal detriment (does/promises something they are not legally bound to do, or forbears a legal right) that is bargained for by the promisor — courts do not weigh adequacy, only the existence of a bargain.
The PREEXISTING DUTY RULE: a promise to do what one is already legally bound to do is not consideration; at common law, contract MODIFICATIONS need new consideration, but the UCC (2-209) enforces good-faith modifications of goods contracts WITHOUT new consideration.
Illusory promises, past consideration, and gifts are NOT consideration; but requirements/output contracts (2-306) and conditional promises are supported by consideration because they constrain discretion in good faith.
PROMISSORY ESTOPPEL (Restatement 90) substitutes for consideration: a promise the promisor should reasonably expect to induce reliance, which DOES induce substantial detrimental reliance, is enforceable to the extent necessary to avoid injustice (often reliance-based recovery).
Recognized consideration substitutes include promissory estoppel, the moral-obligation/material-benefit rule for past benefits (minority), and the UCC firm-offer and good-faith-modification rules.
Last updated: June 2026
The Bargained-for Exchange
Consideration is what distinguishes an enforceable promise from a gratuitous one. It has two components: (1) legal value — the promisee incurs a legal detriment by doing, promising to do, or forbearing something they had a legal right not to do (or to do); and (2) a bargain — the detriment is sought by the promisor in exchange for the promise, and the promise is given in exchange for the detriment.
The classic case is Hamer v. Sidway : an uncle's promise to pay a nephew $5,000 to refrain from drinking, smoking, and gambling was supported by consideration because the nephew forbore legal rights, even though abstaining arguably benefited him.
Courts do not inquire into the adequacy of consideration — a peppercorn can support a promise, and unequal exchanges are enforceable. (Gross inadequacy is relevant only as evidence of fraud, duress, or unconscionability.) But the consideration must be real: a 'sham' or nominal recital ('in consideration of $1') that was never actually exchanged may fail. The bargain element is what defeats gifts : 'I promise to give you my car' is a gift promise, unenforceable for lack of a bargained-for return.
What Is NOT Consideration
Defective 'consideration' Why it fails
Past consideration An act already performed cannot be bargained for; the promise comes after the fact ('I'll pay you for the help you gave me last year')
- Preexisting legal duty Doing what you are already legally bound to do is no detriment
- Illusory promise 'I'll buy as many as I want' reserves unfettered discretion; no commitment, no detriment
- Gift / gratuitous promise No bargained-for exchange
- Moral obligation (majority) Not legally bargained for (but see material-benefit minority rule)
Note the rescues: A requirements contract ('all I need') or output contract ('all you produce') is NOT illusory under 2-306 because the buyer/seller is bound to deal exclusively and in good faith , with quantities not unreasonably disproportionate to any estimate. A conditional promise is valid consideration even if the condition may not occur, because the promisor surrenders the right to refuse if the condition happens.
The material-benefit rule (a minority/Restatement 86 position) enforces a later promise to pay for a past benefit conferred without gift intent — e.g., a promise to pay someone who saved your life — but the majority still rejects past consideration.
The Preexisting-Duty Rule and Modification
Under the preexisting-duty rule , a promise to perform — or actual performance of — an existing legal obligation is not consideration. Its most tested application is modification :
Common law: A modification needs NEW consideration. A contractor who threatens to walk off a job unless paid more, and gets a promise of more money for the SAME work, generally cannot enforce it (the Alaska Packers problem). Exceptions: (1) the modification reflects unforeseen difficulties not anticipated (Restatement 89); (2) the duties are altered, even slightly; (3) the parties mutually rescind and form a new contract; or (4) a third party's promise is involved.
UCC (2-209): A good-faith modification of a goods contract needs NO new consideration . The only check is good faith and, where applicable, the Statute of Frauds (a modified price pushing the deal over $500 must satisfy 2-201) and any 'no oral modification' (NOM) clause (2-209(2)), though a party may waive a NOM clause by conduct.
Accord and satisfaction: Where a debt is genuinely disputed or unliquidated, the debtor's payment of a lesser amount tendered as full settlement (often a 'payment in full' check) can discharge the whole debt — the dispute supplies consideration. If the debt is liquidated and undisputed, paying less is no satisfaction (preexisting duty).
Promissory Estoppel as a Consideration Substitute
When a promise lacks consideration, promissory estoppel (detrimental reliance) under Restatement (Second) 90 may still make it enforceable. The elements:
- A promise the promisor should reasonably expect to induce action or forbearance;
- Which does induce such action or forbearance;
- The reliance is detrimental, definite, and substantial ; and
Injustice can be avoided only by enforcing the promise.
Recovery is measured 'as justice requires' and is often limited to reliance damages (out-of-pocket loss) rather than full expectation, though courts have discretion. Promissory estoppel is the basis for enforcing charitable subscriptions, gratuitous bailment promises, employer pension promises, and — in construction-bid cases ( Drennan v. Star Paving ) — a subcontractor's bid relied on by a general contractor, even before the prime contract is awarded.
Essay tip: Always do the consideration analysis FIRST. Only when consideration is missing do you pivot to promissory estoppel as a fallback theory. Pair it with quasi-contract (unjust enrichment / quantum meruit) when one party has conferred a measurable benefit and you need restitution rather than enforcement of a promise.