Section 2-205 of the UCC provides an exception to the rule that an offeror is the “master of the offer” or that he has a right to revoke the offer at any time. It provides that “an offer given by a merchant in a signed writing which gives assurance that it will be held open is not revocable, but in no event may such period of irrevocability exceed three months.” The CISG’s firm offer rule is found in Article 16. It provides that an offer cannot be revoked “if it indicates that it is irrevocable or if it was reasonable for the offeree to rely on the offer being irrevocable and the offeree has acted in reliance on the offer.” Do you see any significant differences between these two versions of the firm offer rule?

Which version is broader? Why?