
In contract law, an offer can be revoked anytime before it is accepted, but the revocation must meet specific legal criteria to be valid. The revocation must be effectively communicated to the offeree before they accept the offer. If the offeree has started performing their end of the bargain, the offeror can no longer revoke the offer. However, if the offeree has only begun preparing to perform but has not yet started, the offeror can revoke. An exception to this rule is option contracts, where the offeror cannot revoke the offer once the offeree has accepted, even if they have not yet performed. Additionally, if an offer specifies a time frame for acceptance, it does not become irrevocable unless consideration is provided to keep the offer open.
| Characteristics | Values |
|---|---|
| Time period | Offers with a specified time period can still be revoked unless consideration is provided to keep them open. |
| Communication | Revocation must be effectively communicated to the offeree for it to take effect. |
| Unilateral offers | Unilateral offers cannot be revoked once the offeree begins performance. |
| Counter-offers | Counter-offers terminate the original offer. |
| Direct communication | An offer is considered revoked if there is direct communication between the offeror and the offeree. |
| Indirect communication | An offer is considered revoked if the offeree receives reliable information that the offeror has taken action showing that they have changed their mind. |
| Exceptions | Offers made to the public can be revoked by publishing the revocation in the same fashion that the offer was published. |
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What You'll Learn

Offers with specified time periods
An offer with a specified time period, also known as an "option", must remain open for a set period of time. During this time, the offeror cannot revoke the contract, and the offeree is free to consider the contract until it expires.
However, this does not make the offer irrevocable unless additional consideration is provided to keep the offer open. This means that the offeror retains the right to revoke the offer unless they are legally bound to keep it open. For example, in a case where an offeror made an offer to sell a property and stated it would remain open for six weeks, the court held that they had the right to withdraw the offer as no consideration had been provided by the offeree to keep the offer open.
Option contracts usually involve some form of payment from the offeree to the offeror, in exchange for the promise to keep the offer open until a certain time. This is common in business situations, where haggling over price is the most common type of negotiation. However, parties can also negotiate other key terms such as the quantity, timeline, and scope of work.
Limited-time offers are a type of promotional strategy used in marketing to boost sales and create a sense of urgency among customers. These offers are typically available for a short, specific period and can be advertised through various channels such as website pop-ups, email marketing, social media, and influencers. Examples of limited-time offers include flash sales, holiday specials, and early-bird specials.
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Revocation communication
In common law, an offer can be revoked anytime before it is accepted. However, this revocation must be effectively communicated to the offeree (the person to whom the offer is made) for it to be valid. This communication must occur before the offeree accepts the offer. If the other party is unaware of the revocation and proceeds to accept the offer, the acceptance stands.
For instance, if you offer to sell a box of cookies for $1 and then change your mind and withdraw the offer before the other party accepts, the offer has been revoked, and the other party's power to accept the offer is terminated.
The revocation must reach the offeree to be valid. If the offeree does not receive the revocation, it is considered invalid. For example, if you offer to clean a carpet for $800, but then decide to charge $1,200, you must inform the customer of the new price. If they are not informed and accept the original offer, you are bound to honour it.
There are exceptions to the rule of revocation. Offers with specified time periods can still be revoked unless consideration is provided to keep them open. If the offeree has begun performing a unilateral contract, the offeror cannot revoke the offer. However, if the offeree has only begun preparing to perform but has not started, the offeror can revoke.
In the case of offers made to the public, the revocation must be published in the same manner as the original offer. For example, if a reward is offered to the public and then revoked, publishing the revocation in the same manner terminates the power of acceptance, even for those who did not see the revocation. An offer is also considered revoked if the offeree receives reliable information that the offeror has taken action indicating a change of mind, even without direct communication.
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Unilateral offers
A unilateral contract is formed when one party makes a promise in exchange for the other party's performance of a specific act. The promise is only binding if the other party performs the specified act. For instance, in Williams v. Carwardine (1833), an advertisement for a reward constituted a unilateral contract, with the advertiser intending to be bound as soon as the information was communicated.
In the case of unilateral contracts, the general rule is that the offeror can revoke the offer at any time before the offeree has completed their performance of the act. However, under modern rules, an offer for a unilateral contract cannot be revoked once the offeree has begun performance, unless the performance is not completed within a reasonable time. This modern rule was illustrated in the case of Petterson v. Pattberg (1928).
The case of Luxor (House of Lords) further clarifies the rule regarding unilateral offers. It states that a unilateral offeror can revoke the offer even after the offeree has started performing the act, as long as the offer includes the condition that the offeror can revoke at any time until the act is fully performed. This means that the offeror's ability to revoke depends on the specific terms of the unilateral offer.
It is important to note that the revocation of a unilateral offer does not need to be directly communicated to each offeree. Instead, it is sufficient to issue the revocation through the same channel used to make the original offer. This principle was established in the American case of Shuey v. US.
In summary, unilateral offers are unique in that they involve a promise made by one party in exchange for the performance of an act by another party. The offeror generally has the right to revoke the offer before the offeree completes the act, but this depends on the specific terms of the offer. Revocation of unilateral offers does not require direct communication to each offeree and can be done through the same channel as the original offer.
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Counter-offers
A counter-offer is a response to an original offer that introduces new or modified terms to the original offer. It is a rejection of the initial offer and starts a new offer from the original recipient to the original offeror. A counter-offer has a few key features under law. Firstly, it is a rejection of the initial offer, and secondly, it starts a new offer from the original recipient to the original offeror. After a counter-offer has been made, the opposing party has the same options as the original recipient – they can accept, reject, or counter-offer the new proposal.
The "mirror image rule" states that acceptance of a counter-offer must be an agreement to each and every term of the counter-offer without any changes. In other words, if an acceptance deviates from the offer in any way, it is deemed a qualified or conditional acceptance and does not constitute a valid acceptance. Instead, it has the legal effect of a counter-offer. For example, if Marsha offers to sell Jan a box of cookies for $1 and, before Jan accepts, Jan offers to buy the cookies for $0.50, Jan has made a counter-offer.
It is important to note that counter-offers terminate the original offer. However, information requests do not. For example, a query regarding payment terms would not be considered a counter-offer and would not revoke the original offer. The court clarified that merely seeking clarification or additional details does not invalidate the initial offer.
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Death or incapacity of the offeror
The death or incapacity of the offeror can result in the termination of the offeree's power of acceptance. This means that the offeree can no longer accept the offer and form a contract, even if they are unaware of the offeror's death or incapacity. This rule applies to all types of contracts, including unilateral and bilateral agreements.
For instance, if an individual offers to paint a barn in exchange for a payment of $500, they cannot revoke the offer once they have started painting. In this case, the offeree has started to perform the task, and the offeror is bound by the implied option contract. However, if the offeror dies or becomes incapacitated before starting to paint, the offeree's power of acceptance is terminated, and a contract cannot be formed.
It is important to note that the death or incapacity of the offeror does not affect the offeree's power of acceptance under an option contract. In such cases, the contract remains binding on the offeror's estate, provided that the individual performance of the decedent was not part of the proposed agreement. For example, if an offeror grants the option to purchase property, this offer remains valid even after their death.
The death or incapacity of the offeror is a valid reason for the termination of the offeree's power of acceptance. However, it is essential to consider other factors, such as the type of contract and the specifics of the offer. In some cases, the offeree's power of acceptance may be terminated due to the lapse or expiration of the offer, or through indirect revocation, where the offeree receives reliable information indicating that the offeror has changed their mind.
In summary, the death or incapacity of the offeror generally results in the termination of the offeree's power of acceptance, except in the case of option contracts where the individual performance of the decedent is not specified. This rule ensures that the rights and obligations of both parties are respected, even in unforeseen circumstances.
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Frequently asked questions
An offer can be revoked at any time before it is accepted. However, the revocation must meet specific legal criteria to be valid.
The revocation must be effectively communicated to the offeree before they accept the offer. If the other party does not know that the offer has been revoked and they accept, then the acceptance stands.
Yes, there are two main exceptions. Firstly, if the offer is made to the public, it can be revoked by publishing the revocation in the same way that the offer was published. Secondly, an offer can be revoked even without direct communication between the offeror and the offeree if the offeree receives reliable information that the offeror has changed their mind. In addition, an offer with an expiration date or a specified time period, also known as an "option", must remain open for the stated period of time and cannot be revoked during that time.










