
Common law contracts are accepted under a 'mirror image' rule, which means that an 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. An offer may be invalid if it is not clearly communicated or if it is made in jest. An offer may also be invalid if it is not accepted within a specific period, or if an unreasonable amount of time has passed between offer and acceptance. Generally, death or incapacity of the offeror terminates the offer, unless it is an option contract.
| Characteristics | Values |
|---|---|
| Offer is not clearly communicated | Not valid |
| Offer is made in jest | Not valid |
| Offer cannot be met by its terms | Not valid |
| Offer is not accepted within a specific period | Terminated |
| Offer is revoked by operation of law | Not valid |
| Death or incapacity of offeror | Terminated |
| Acceptance differs from the offer | No contract |
| Acceptance is not an absolute and unqualified acceptance of all terms | No contract |
| Advertisements | Not considered offers |
| Common law contracts | Require consideration for contract modification |
| UCC | Does not require consideration for contract modification |
| Common law | Requires price to be stated |
| UCC | Does not require price to be stated |
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What You'll Learn

Offer not communicated clearly
For an offer to be considered valid, it must be communicated clearly. This means that the offer must be presented in a way that is understandable and unambiguous to the offeree. The offer must also be successfully transmitted to the offeree, as an offer is not effective until it is received. For example, an email containing an offer that is written but not sent does not constitute a valid offer.
The expression of an offer may take various forms, including letters, advertisements, emails, or verbal communication. Regardless of the medium, the offer must communicate the basis on which the offeror intends to contract. The offer must be clear, definite, and outline specific terms and conditions, such as the price or other expectations.
In some cases, the language used may be tentative, and it can be unclear whether it constitutes an offer or a request for further information. For example, in the case of Storer v MCC, the language "will you accept around £1400" was considered debatable as to whether it was sufficiently clear and certain to be construed as an offer.
Additionally, advertisements are generally not considered offers but are instead invitations to treat, inviting further negotiations. For instance, a store advertising a sale is inviting customers to make offers to buy, rather than promising to sell at the advertised price.
To be a valid offer, the proposal must be capable of acceptance by the offeree. The offeree must be able to clearly understand the terms of the offer and accept them without any modifications. Any changes to the original offer during acceptance are considered a counteroffer, which terminates the original offer and initiates a new negotiation.
In summary, for an offer to be considered valid, it must be communicated clearly, successfully transmitted to the offeree, and presented in a way that is unambiguous and outlines specific terms.
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Offer made in jest
An offer made in jest is not a valid offer under common law. An offer is only valid if it expresses an intention to enter into a binding agreement. This intention is judged by an objective standard, based on the conduct of the offeree. In other words, the question is how a reasonable person would view the situation, not the subjective intentions of the offeror.
A case in point is Keller and Holderman, who were jesting with each other one day. Holderman offered to buy Keller's watch for $300. Keller accepted the offer and received a note to that effect. However, Holderman contended that he had no intention of entering into a contract and that Keller knew he was merely jesting. The court agreed with Holderman, judging that no contract had been made.
Another example is the case of Wright Shannon, who, after having his hat knocked off by a snowball, stated in front of the culprit's father: "Someone knocked my hat off with a snowball this morning. I offer $15 for the name of the person, for I want to put him in jail". The father accepted the offer and told Shannon the name of the boy, his son. However, Shannon refused to pay, and the father brought a suit to recover. The court ruled in Shannon's favour, as the offer had been made in jest and was therefore not valid.
The above cases illustrate that for an offer to be valid, it must be seriously intended to result in a binding agreement. Offers made in jest, or as a joke, do not meet this criterion and are therefore not legally binding.
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Terms that cannot be met
An offer is an expression of willingness to enter into a contract on certain terms. It is important to establish what is and is not an offer. Offers must be firm, not ambiguous or vague.
An offer may be express or implied. For example, one party may explicitly state, verbally or in writing, an intent to enter into a binding contract, stating all terms. On the other hand, a party may imply a contract by their actions. Many commercial transactions occur this way.
To be accepted, an offer must be clearly communicated so that it can be knowingly accepted or rejected. The circumstances surrounding the making of the offer can have an impact on whether it is valid. For example, an offer made in jest will not be considered valid. Furthermore, an offer that, by its terms, cannot be met will not be construed as a valid offer. If someone offers to pay you a trillion dollars for your car, it is unlikely to be enforced, as it is probably impossible for them to come up with that kind of money.
The expression of an offer may take different forms, and which form is acceptable varies by jurisdiction. Offers may be presented in a letter, newspaper advertisement, fax, email, verbally, or even conduct, as long as it communicates the basis on which the offeror is prepared to contract.
The "mirror image rule" states that if you are to accept an offer, you must accept it exactly, without modifications. If there is any variation, even on an unimportant point, there is no contract. The acceptance must be absolute without any deviation, in other words, an acceptance in the "mirror image" of the offer.
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Acceptance not matching offer
Acceptance is judged by an objective standard, based on the conduct of the offeree. In other words, a reasonable bystander must be able to perceive that the offeree has accepted the offer.
The "mirror image" rule, also known as the matching-acceptance rule, is a principle in common law that dictates that acceptance of an offer must be absolute, positive, unconditional, unequivocal, and unambiguous. This means that the terms of acceptance must correspond exactly with the terms of the offer. If there is any variation, even on an unimportant point, there is no contract. For example, if a seller offers to sell a car for $10,000, and the buyer responds, "I accept, but only if you include new tires," this would not be considered a valid acceptance under the matching-acceptance rule. The buyer's response changes the original terms of the offer and therefore does not match.
The purpose of the matching-acceptance rule is to ensure that both parties clearly understand the terms of the contract and to prevent potential disputes that could arise if the terms of acceptance differ from those of the offer.
It's important to note that the traditional common law perspective treated advertisements as unable to contain offers. However, this view has evolved, and in some jurisdictions, advertisements may now be considered valid offers. For example, in the leading English case of Smith v. Hughes, the court emphasised that the determination of a valid offer depends on how a reasonable person would view the situation, rather than the party's own subjective intentions.
Additionally, the method of acceptance may be specified by the offeror. In such cases, the offeree must accept by a method that is no less effective than the specified method from the offeror's perspective.
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Offeror's death
In common law, an offer is considered valid and capable of being accepted if it expresses an intent to enter into a binding agreement. This can be done either explicitly or implicitly. However, the death of the offeror prior to acceptance generally terminates the offer, and it is said that the offer dies with the offeror.
The death of the offeror prior to acceptance renders the offer invalid and terminates it. This means that if the offeror passes away before their offer is accepted, the offer is no longer valid and cannot be accepted by the offeree. The offeree cannot accept the offer if they are aware of the offeror's death. However, if the offeree accepts without knowledge of the death, the contract may still be valid, depending on the nature of the offer. If the contract involves characteristics or skills unique to the offeror, their death effectively voids the offer.
For example, consider a skilled artist who offers to paint a mural for a client. If the artist passes away before the client accepts the offer, the offer is terminated, and the client cannot accept it, especially if they are aware of the artist's death. Even if the client accepts without knowing about the death, the offer may not be valid due to the unique artistic skills involved.
It is important to note that the death of a party to a contract does not always terminate it. In some cases, the estate of the deceased person may still be liable for a contract they entered into before their death. Additionally, in the case of option contracts, the next of kin or an assigned friend of the offeror may take their place after death, allowing the offer to remain valid.
The termination of an offer upon the death of the offeror is an important aspect of contract law. It highlights the significance of timely acceptance and the unique nature of certain offers that are intrinsically linked to the offeror's skills or characteristics.
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Frequently asked questions
An offer is considered valid and capable of being accepted if it expresses an intent to enter into a binding agreement. This can be done verbally, in writing, or implied by conduct.
Under common law, the 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, there is no contract.
The UCC takes a more liberal approach and allows for acceptance even when terms of acceptance differ from the terms of the offer. The UCC also does not require consideration for contract modifications, unlike common law.
No, an offer made in jest or as a joke will not be considered valid.
Generally, an offeree is not bound if another person accepts the offer on their behalf without authorization. However, exceptions may apply under the law of agency or if the contract is ratified within a reasonable time.





























