Except for an option contract, a firm offer by a merchant is irrevocable once it has been made.

Question

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A firm offer by a merchant, under the Uniform Commercial Code (UCC), can be irrevocable even without consideration if it is in writing and signed by the offeror, and explicitly states by its terms that it will be held open. This does not apply only to option contracts; a firm offer itself can be irrevocable under these conditions.

Except for an Option Contract, a Firm Offer by a Merchant