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Acceptance of an offer is the expression of assent to its terms. Acceptance must generally be made in the manner specified by the offer. If no manner of acceptance is specified by the offer, then acceptance may be made in a manner that is reasonable under the circumstances. An acceptance is only valid, however, if the offeree knows of the offer, the offeree manifests an intention to accept, and the acceptance is expressed as an unequivocal and unconditional agreement to the terms of the offer.

Many offers specify the method of acceptance, whether it be oral or written, by phone or in person, by handshake or by ceremony. Other offers leave open the method of acceptance, allowing the offeree to accept in a reasonable manner. Most consumer transactions fall into this category, as when a shopper “accepts” a merchant’s offer by taking possession of a particular good and paying for it at the cash register. But what constitutes a “reasonable” acceptance will vary according to the contract.

Some offers may only be accepted by the performance or non-performance of a particular act. Once formed, these types of agreements are called unilateral contracts, and they are discussed more fully later in this essay. Other offers may only be accepted by a return promise of performance from the offeree. Once formed, these agreements are called bilateral contracts, and they are also discussed more fully later in this essay.

Problems can arise when it is not clear whether an offer anticipates the method of acceptance to come in the form of performance or a return promise. Section 32 of the Restatement (Second) of Contracts attempts to address this issue by providing that “in case of doubt an offer is interpreted as inviting the offeree to accept either by promising to perform what the offer requests or by rendering performance, as the offeree chooses.” A growing number of jurisdictions are adopting this approach.

Jurisdictions are split as to the time when an air-mailed acceptance becomes effective. Under the majority approach, known as “the mailbox rule,” an acceptance is effective upon dispatch in a properly addressed envelope with prepaid postage, even if the acceptance is lost or destroyed in transit. Under the minority approach, acceptance is effective only upon actual receipt by the offeror, no matter what precautions the offeree took to ensure that the acceptance was properly mailed.

In certain cases acceptance can be implied from a party’s conduct. Suppose a consumer orders a personal computer (PC) with exact specifications for its central processing unit (CPU), hard drive, and memory. Upon receipt, the consumer determines that the PC does not match the specs. If the consumer nonetheless pays the full amount on the invoice accompanying the PC without protest, the consumer has effectively communicated a legally binding acceptance of the non-conforming good.

Acceptance cannot generally be inferred from a party’s silence or inaction. An exception to this rule occurs when two parties have a prior course of dealings in which the offeree has led the offeror to believe that the offeree will accept all goods shipped by the offeror unless the offeree sends notice to the contrary. In such instances, the offeree’s silence or inaction constitutes a legally binding acceptance upon which the offeror can rely.

Inside Acceptance