§ 22. Mode Of Assent: Offer And Acceptance
(1) The manifestation of mutual assent to an exchange ordinarily takes the form of an offer or proposal by one party followed by an acceptance by the other party or parties.
a. The usual practice. Subsection (1) states the usual practice in the making of bargains. One party ordinarily first announces what he will do and what he requires in exchange, and the other then agrees. Where there are more than two parties, the second party to agree may be regarded as accepting the offer made by the first party and as making a similar offer to subsequent parties, and so on. It is theoretically possible for a third person to state a suggested contract to the parties and for them to say simultaneously that they assent. Or two parties may sign separate duplicates of the same agreement, each manifesting assent whether the other signs before or after him. Compare Illustration 5 to § 23.
b. Assent by course of conduct. Problems of offer and acceptance are important primarily in cases where advance commitment serves to shift a risk from one party to the other, as in sales of goods which are subject to rapid price fluctuations, in sales of land, and in insurance contracts. Controversies as to whether and when the commitment is made are less likely to be important even in such cases once performance is well under way. Offer and acceptance become still less important after there have been repeated occasions for performance by one party where the other knows the nature of the performance and has an opportunity for objection to it. See Uniform Commercial Code § 2-208(1); compare Comment a to § 19. In such cases it is unnecessary to determine the moment of making of the contract, or which party made the offer and which the acceptance. Thus, Uniform Commercial Code §§ 2-204 and 2-207(3), relating to contracts for the sale of goods, provide that conduct by both parties which recognizes the existence of a contract is sufficient to establish it although the writings of the parties do not otherwise establish a contract. The principle has also been applied in non-sales contexts.