Also known as:lacking consideration · no consideration · absence of consideration
Written by attorneys · grounded in primary & secondary sources — see below
The absence of a bargained-for exchange that prevents a promise from becoming enforceable as a contract. A promise fails this requirement when the promisor receives no legal detriment or the promisee gives nothing in return that the promisor seeks. Courts treat this defect as an invalidating cause that defeats formation or enforcement.
Sources & Authorities· 4 primary sources
Select any source to read its text and confirm it supports the definition.
Uniform Acts
Restatements
Casebooks
Hornbooks
How it applies
Common Examples
6
Invalidating Cause in Integrated Writing
Luna Lang signed a detailed supply agreement with Lexicon Media that recited a fixed price for software licenses. After performance disputes arose, Lexicon Media claimed the writing was unenforceable because Luna Lang had given no separate promise or act in exchange for the recited price. The court examined whether lack of consideration invalidated the agreement despite its integrated form.
Merchant Firm Offer Remains Open
Lakeshore Industries, a merchant seller of industrial parts, signed a written quote to Lunar Dynamics promising to hold listed prices open for sixty days. When market prices rose, Lakeshore Industries attempted to revoke before acceptance. Lunar Dynamics accepted within the period, and the court enforced the deal even though no separate payment supported the assurance.
Oral Modification Binds Without New Exchange
Lumen Capital and Lucia Lopez had a written five-year equipment lease. Midway through, they orally agreed to extend the term by two years at the same monthly rate after an unexpected regulatory change increased costs. Lumen Capital later refused the extension, but the court held the modification enforceable despite the absence of fresh consideration.
Uncle's Promise Enforced by Nephew's Forbearance
An uncle promised his nephew five thousand dollars if the nephew refrained from drinking, smoking, and gambling until age twenty-one. The nephew fully performed the requested restraint. When the uncle's estate refused payment, the court held that the nephew's forbearance supplied the required exchange.
Hamer v. Sidway124 N.Y. 538
Written Modification Enforced Without Fresh Exchange
Wisconsin Knife Works and National Metal Crafters had an ongoing supply contract that required written change orders. The parties later exchanged emails altering delivery schedules and quantities without any new payment or concession. National Metal Crafters later claimed the changes lacked consideration, but the court enforced them under the governing statute.
Wisconsin Knife Works v. National Metal Crafters781 F.2d 1285, 1286
Subcontractor Bound by Reliance Despite No Payment
A general contractor relied on a paving company's written bid when preparing its own prime contract submission. The paving company attempted to withdraw the bid before the general contractor accepted, citing lack of consideration for keeping the bid open. The court held the bid irrevocable because the general contractor's foreseeable reliance supplied the binding force.
Drennan v. Star Paving Co.51 Cal. 2d 409, 333 P.2d 757 (1958)
Common questions
Frequently Asked
5
Does lack of consideration prevent enforcement of a merchant's firm offer under the UCC?+
No. A merchant's signed written offer that gives assurance it will be held open is irrevocable for the stated time or a reasonable time up to three months even though no separate consideration supports the assurance. The statute expressly removes the common-law requirement of consideration for such firm offers.
Supporting sources
Can parties modify a contract for the sale of goods without new consideration?+
Yes. Under UCC Article 2 an agreement modifying a contract for the sale of goods needs no consideration to be binding. The modification is enforceable once the parties reach agreement, subject only to any statute-of-frauds or no-oral-modification clause requirements.
How does lack of consideration function as an invalidating cause in contract litigation?+
It is listed among the grounds, such as fraud or duress, that may be proved by extrinsic evidence even when a writing appears integrated. A party may therefore introduce evidence that no bargained-for exchange ever occurred, rendering the promise unenforceable despite the document's form.
Supporting sources
Does forbearance from a legal right ever supply the missing exchange?+
Yes. Refraining from conduct one has a legal right to pursue, such as drinking or gambling, can constitute consideration when the promisor seeks that forbearance in exchange for the promise. Courts have long recognized such detriment as satisfying the requirement.
Supporting sources
What happens when a subcontractor attempts to revoke a bid after the general contractor has relied on it?+
The bid becomes irrevocable. Reasonable reliance by the general contractor in preparing its own bid creates an implied subsidiary promise not to revoke, preventing the subcontractor from withdrawing even though no separate payment supported the bid.
Supporting sources
consideration
as…
is not fatal to the enforcement of such a promise. It is true that in the case of unilateral contracts the Restatement finds
consideration
for the implied subsidiary promise in the part…
to be binding. (2) A signed agreement which excludes modification or rescission except by a signed writing cannot be otherwise modified or rescinded, but except as between merchants such a…
to support a contract.” In Gee v. Pritchard (2 Swanst. 402) B attempted to print a private letter written him by A, and he was restrained on the ground that the property of that private…
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