United States contract law

United States contract law regulates the obligations established by agreement (express or implied) between private parties in US law. The law varies from state to state; there is no nationwide Federal contract law, although transactions involving the sale of goods have become highly standardized nationwide through widespread adoption of the Uniform Commercial Code. There remains significant diversity in the interpretation of other kinds of contracts, depending upon the extent to which a given state has codified its common law of contracts or adopted portions of the Restatement (Second) of Contracts.

Parties are permitted to agree to arbitrate disputes arising from their contracts. Under the Federal Arbitration Act (which has been interpreted to cover all contracts arising under federal or state law), arbitration clauses are generally enforceable unless the party resisting arbitration can show unconscionability or fraud or something else which undermines the entire contract.

A contract is an agreement between two or more parties creating reciprocal obligations enforceable at law. The elements of a contract are mutual assent, consideration, legally competent parties and legal purpose.

Mutual assent is also known as ratification and meeting of the minds is typically established through the process of offer and acceptance. However, contracts can also be implied in fact, as discussed below. At common law, the terms of a purported acceptance must be the "mirror image" of the terms of the offer. Any variation thereof constitutes a counteroffer.

An offer is a display of willingness by a promissor to be legally bound by terms they specify, made in a way that would lead a reasonable person in the promisee's position to understand that an acceptance is being sought and, if made, results in an enforceable contract. Ordinarily, an offeror is permitted to revoke their offer at any time prior to a valid acceptance. This is partially due to the maxim that an offeror is the "master of his offer."

In the case of options, the general rule stated above applies even when the offeror promises to hold the offer open for a certain period of time. For example, Alice says to Bob, "I'll sell you my watch for $10, and you can have a week to decide." Alice is free to revoke her offer during the week, as long as Bob has not accepted the offer.

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