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Offer and acceptance

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In contract law, the formation of a binding agreement requires several essential elements. Two of the most critical requirements are offer and acceptance. An offer is a manifestation of willingness to enter into a bargain. It must be made in a way that justifies another person in understanding that their assent will conclude the deal. This person receiving the offer is known as the offeree. The person making the offer is called the offeror. Together, these elements form the core of many legal agreements. Without a clear offer and a valid acceptance, a contract cannot legally exist.

An offer can take many different forms depending on the jurisdiction. It might be presented through a letter, an email, or a fax. It can even be expressed verbally or through specific conduct. Traditionally, common law viewed newspaper advertisements as something other than a formal offer. However, this view has changed in many modern legal systems. For an offer to be legally binding, it must contain the key terms of the agreement. In some places, a sale of goods contract must include a delivery date and a price. It also requires terms of payment and a detailed description of the item or service. If these minimum requirements are missing, courts may classify the statement as an advertisement instead of a legal offer.

To be valid, an offer must be serious and demonstrate real intent. Courts often use an objective test to determine this. This means they do not look at what a person was thinking privately. Instead, they look at how a reasonable person would view the situation. In the English case Smith v. Hughes (1871), the court emphasized this objective standard. This prevents people from claiming a deal was a joke after it is made. However, obvious jokes do not count as offers because they lack actual intent. In Leonard v. Pepsico, Inc., a commercial showed a military aircraft offered for "Pepsi Points." The court ruled this was a joke rather than a serious offer. In contrast, the case of Lucy v. Zehmer showed that certain statements can become binding contracts if a reasonable observer would see them as serious.

When a person responds to an offer, they must be careful with their words. The "mirror image rule" states that an acceptance must match the offer exactly. If the offeree changes any part of the terms, they have made a counter-offer. A counter-offer effectively kills the original offer. Once a counter-offer is made, the original offer cannot be accepted later. In Morton v. 4 Orchard Lane Trust (2004), the court found that proposing modifications meant there was no "meeting of minds." This rule ensures that both parties are agreeing to the exact same terms and conditions.

There are different types of contracts, such as unilateral and bilateral contracts. A bilateral contract involves an exchange of promises between two parties. For example, one person promises to sell a car, and the other promises to pay for it. A unilateral contract is different because it is made in return for the performance of an act. In these cases, acceptance is shown through conduct rather than a spoken promise. A famous example is Carlill v. Carbolic Smoke Ball Co. The company offered 100 pounds to anyone who used their product and still caught the flu. Mrs. Carlill accepted the offer by using the product and subsequently contracting the flu. This performance fulfilled the terms of the unilateral contract.

It is also important to distinguish an offer from an "invitation to treat." An invitation to treat is merely an indication of willingness to negotiate. It is a pre-offer communication intended to solicit offers from others. For instance, displaying goods in a shop window or on a shelf is usually an invitation to treat. In the case of Fisher v. Bell (1961), shop window displays were treated this way. Similarly, the case of Harvey v. Facey (1893) showed that indicating a price is not the same as making an offer. Public auctions also follow this pattern. Usually, the bidders are the ones making the offers. The auctioneer accepts the bid when the hammer falls, as seen in British Car Auctions Ltd v. Wright (1972).

Finally, an offeror generally has the right to revoke an offer before it is accepted. However, this revocation must be communicated to the offeree. In some cases, such as "firm offers" under the U.S. Uniform Commercial Code, an offer may be irrevocable for a set period. This applies to merchants who provide a signed writing. Additionally, in unilateral contracts, an offeror generally cannot revoke the offer once the offeree has begun performing the required act. Understanding these rules helps maintain order in commerce and ensures that people understand their legal responsibilities when making deals.

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