
The formation of a contract is a key concept in common law, and a contract is formed when an offer is accepted. For an offer to be effective, it must be communicated to the offeree, the offeror must intend to be bound by the offer, and the terms of the offer must be reasonably definite so that all parties understand them. Acceptance must be absolute and unqualified, with no deviation from the terms of the offer. This is known as the mirror image rule. In unilateral contracts, the offeree must notify the offeror that they have begun to perform the terms of the contract. If the offeree does not receive the offer, they cannot accept it.
| Characteristics | Values |
|---|---|
| Communication | The offer must be communicated to the offeree |
| Intention | The offeror must intend to be bound by the offer |
| Definiteness | The terms of the offer must be reasonably definite so that all parties understand them |
| Acceptance | Acceptance must be absolute and unqualified, with no deviation from the terms of the offer |
| Notification | For unilateral contracts, the offeree must notify the offeror that they have begun to perform the terms of the contract |
| Irrevocability | An offer may be terminated by revocation, counteroffer, or the passing of a reasonable amount of time |
| Statute of Frauds | Contracts for the purchase of real property, contracts that cannot be performed in less than a year, and contracts that guarantee the debt of another must be in writing |
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What You'll Learn

Communication to the offeree
Communication of acceptance is generally implied in unilateral contracts, where the offeree must notify the offeror that they have begun to perform the terms of the contract. Without this notification, the offeror may treat the offer as having lapsed after a reasonable time. In bilateral contracts, which are the most common type, both parties are in agreement, and the offeree must communicate their acceptance to the offeror.
The method of communication can be specified by the offeror, and the offeree must then accept by a method that is no less effective from the offeror's perspective than the one specified. For example, if an offer is communicated by post, the offeree may accept by post or by a method that is equally effective.
The requirement of communication to the offeree is distinct from the requirement of an objective perspective, which is also necessary for an offer to be effective. This means that a reasonable bystander would perceive that the offeree has accepted the offer based on their conduct. This is in contrast to the old common law rule, which used a subjective perspective, where a party could resist a claim of breach by proving that they did not intend to be bound by the agreement.
In some cases, an offeree may be bound by an offer accepted on their behalf by an agent, who has apparent or ostensible authority to do so. However, this is an exception to the general rule that an offeree is not bound if another person accepts the offer on their behalf without their authorization.
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Intention to be bound
The intention to be bound is a critical aspect of contract law, and it revolves around the question of whether parties intended to create a legally binding agreement. This concept is often referred to as the "meeting of the minds," implying that both parties fully understand and agree to the terms of the contract.
In common law, acceptance of an offer is judged by an objective standard, focusing on the conduct of the offeree. This means that a party cannot argue against a breach of contract by claiming they did not intend to be bound by the agreement, as their undisclosed intentions are irrelevant. Instead, the court will consider whether a reasonable bystander would perceive that the offeree impliedly accepted the offer through their actions. This shift from a subjective to an objective standard is important because it provides clarity and protects parties from potential bad faith claims.
To determine the intention to be bound, courts will examine the specific terms of the contract. Key terms, such as price points, what is being exchanged, and performance expectations, must be clearly defined. This ensures that both parties understand their obligations and rights under the contract. Any ambiguity or vague language can lead to disputes and make it challenging for courts to enforce the agreement.
The intention to be bound can also be impacted by the actions of authorised agents. In certain situations, an agent's acceptance of an offer on behalf of their principal may bind both parties, even if the principal was unaware of the agent's actions. This highlights the importance of clearly establishing the authority of individuals acting on behalf of businesses or individuals.
It is worth noting that certain types of offers, such as advertisements, are generally not considered offers under common law. Instead, they are typically viewed as invitations to make an offer. However, there may be exceptions, as seen in the Lefkowitz case, where an advertised statement can be construed as an offer under specific circumstances.
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Definiteness of terms
For an offer to be effective under common law, the terms of the offer must be reasonably definite so that all parties understand them. This is to ensure that the contract is certain enough to determine liabilities and enable a court to order enforcement or measure damages in the event of a breach.
The requirement of definiteness of terms means that the essential proposed terms must be spelled out with sufficient clarity. This includes terms such as price and the work to be done, which must be detailed with enough precision to ensure that the contract can be enforced. However, not every omission is considered fatal to the contract. For instance, if a missing term can be fixed by referring to an external standard, such as a deadline of "no later than the first frost", the offer is still considered sufficiently definite.
The definiteness of terms is crucial to ensure that there is a "meeting of the minds" between the parties, which is a fundamental principle in contract law. This means that both parties must have a mutual understanding of the offer and its terms, and the acceptance must be an absolute and unqualified acceptance of all the terms of the offer. Any variation, even on an unimportant point, between the offer and the terms of its acceptance, would result in the absence of a contract.
In some cases, disputes may arise when both parties accept the existence of a legally binding contract but disagree on whose standard terms apply. This is known as the "battle of the forms" and can be resolved by referring to the 'last document rule', which holds that the final offer and acceptance occur with the signing or acceptance of the last document. However, this rule may not always apply, as in the case of GHSP Incorporated v AB Electronic Ltd, where the English High Court found that the companies had not agreed on any terms and remained in an unresolved dispute.
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Acceptance must be absolute
The common law requires that an offer must spell out essential proposed terms with sufficient definiteness and certainty of terms that a court can order enforcement or measure damages in the event of a breach. This means that both the offer and acceptance need to be crystal clear, leaving no room for doubt about what each party has agreed to.
Acceptance can be communicated in various ways, including in person, via mail or email, over the phone, or through actions. However, if the offer specifies a method of acceptance, the offeree must follow these instructions for their acceptance to be valid. For unilateral contracts, both common law and the UCC require the offeree to notify the offeror that they have begun to perform the terms of the contract; otherwise, the offeror may treat the offer as having lapsed after a reasonable time.
It is important to note that the death or insanity of the offeror prior to acceptance terminates the offer, as does the destruction of something essential to the contract. In the case of advertisements, price quotations, and similar statements, these are generally not considered offers but invitations. However, under certain circumstances, an advertised statement can be construed as an offer, as shown in the Lefkowitz case.
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Offers can be terminated
Under common law, an offer can be terminated in several ways, including revocation, rejection, lapse of time, conditional offer, operation of law, death, acceptance, and illegality.
Firstly, revocation refers to the retraction of an offer by the offeror. An offer can generally be revoked at any time before acceptance, as long as it is communicated effectively and directly or indirectly to the offeree. However, if the offeree has already begun performing their obligations under the contract, the offeror typically cannot revoke the offer.
Secondly, rejection by the offeree can also terminate an offer. The offeree's power of acceptance is terminated upon their rejection, even if the offer period has not lapsed.
Thirdly, a lapse of time may lead to the termination of an offer. Offers must remain open for the stated time period or, if no time is specified, for a reasonable period. After this period, the offer is considered lapsed.
Additionally, conditional offers are subject to certain conditions being met. If these conditions are not fulfilled, the offer lapses.
Offers can also be terminated by the operation of law, such as a change in legislation that makes the contract unlawful or a court decision affecting the contractual capacity of one of the parties.
Death or insanity of either the offeror or offeree can also terminate an offer, particularly if the contract involves a personal service or artistic performance by the deceased party.
Lastly, an offer is terminated upon acceptance by the offeree, forming a contract. Acceptance can be express or implied through conduct, and it must be absolute and unqualified, matching the terms of the offer exactly.
It is important to note that the termination of an offer may vary depending on the specific jurisdiction and the type of contract involved.
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Frequently asked questions
For an offer to be effective under common law, it must be communicated to the offeree, the offeror must intend to be bound by the offer, and the terms of the offer must be reasonably definite so that all parties understand them.
Under the "mirror image rule", acceptance must be an absolute and unqualified acceptance of all the terms of the offer. If there is any variation, even on an unimportant point, between the offer and the terms of its acceptance, there is no contract.
Acceptance is judged by an objective standard, based on the conduct of the offeree. This means that a party cannot resist a claim of breach by arguing that they did not intend to be bound by the agreement.







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