Chapter: Formation of Contract
Welcome to your study notes for Formation of contract under Paper 2: The market. Contract law governs everyday commercial life, from buying a sandwich at lunchtime to multi-million-pound business agreements. In your Paper 2 exam, questions in this area are scenario-based, requiring you to identify whether a valid, enforceable contract has actually come into existence between the parties.
For a legally binding contract to exist in English law, five essential elements must all be present:
1. Offer
2. Acceptance
3. Consideration
4. Intention to create legal relations (Legal intention)
5. Capacity
Memory tip: Think of the acronym CAICO — Capacity, Acceptance, Intention, Consideration, Offer. If even one of these five building blocks is missing, there is no binding contract!
Note on scope: Once a contract is formed, issues regarding its terms, exclusion clauses, misrepresentation, or third-party rights belong to separate chapters (such as Terms in a contract, Consumer Rights Act 2015, Privity of contract, and Validity and discharge).
---1. Offer
What is an Offer?
An offer is an expression of willingness to contract on specified terms, made with the intention that it will become binding as soon as it is accepted by the person to whom it is addressed (the offeree). The person making the offer is known as the offeror.
An offer must be clear, certain, and communicated to the offeree. Offers can be made to a specific individual, a group of people, or even the entire world (such as a reward advertisement for finding a lost pet).
Offer vs. Invitation to Treat
Don't worry if this distinction seems tricky at first — it is one of the most common stumbling blocks for students, but it is very straightforward once you learn the categories!
An invitation to treat is not an offer. It is merely an invitation to other people to make an offer or negotiate. The person putting forward an invitation to treat does not intend to be bound immediately upon someone else's response.
Common examples of invitations to treat in everyday market situations include:
• Goods displayed on shop shelves or in shop windows: Displaying an item with a price tag is an invitation to treat, not an offer. The customer makes the offer when presenting the item at the cash desk or till, and the shopkeeper is free to accept or refuse that offer.
• Advertisements in newspapers, catalogues, or websites: General advertisements are usually invitations to treat. This protects sellers from being bound to supply goods to thousands of people when they only have limited stock.
• Auctions: In standard auctions, the auctioneer's call for bids is an invitation to treat. Each bid made by a buyer represents an offer. Acceptance takes place when the auctioneer bangs the hammer.
• Tenders: A request asking businesses to submit tenders (competitive bids to complete work) is generally an invitation to treat. Each tender submitted is an offer.
Exception to the advertisement rule: If an advertisement clearly demonstrates an intention to be bound immediately without negotiation (such as a unilateral offer of a cash reward for anyone performing a specific act), the law treats it as a genuine unilateral offer rather than an invitation to treat.
When Does an Offer End? (Termination of an Offer)
An offer does not last forever. An offeree can only accept an offer while it is still "alive" (open). An offer can end in any of the following ways:
1. Revocation (Withdrawal):
The offeror can revoke (withdraw) an offer at any time before it has been accepted, provided the revocation is communicated to the offeree before acceptance takes place. Revocation does not need to be communicated directly by the offeror; it is legally effective if the offeree learns of the withdrawal through a reliable third-party source.
2. Rejection:
If the offeree says "no", the offer is terminated immediately. Once rejected, the offeree cannot change their mind later and try to accept the original offer.
3. Counter-Offer:
A counter-offer occurs when the offeree introduces new terms or attempts to alter the price. A counter-offer has two critical legal consequences:
• It acts as a complete rejection of the original offer (destroying it permanently).
• It creates a brand-new offer that the original offeror can now accept or reject.
Crucial exam distinction: A counter-offer must be distinguished from a mere request for information. If a buyer asks, "Does the price include delivery?" or "Would you consider staggered payments?", they are not rejecting the offer. They are merely clarifying details. The original offer remains open for acceptance.
4. Lapse of Time:
An offer terminates if a specified deadline passes without acceptance. If no deadline is stated, the offer ends after a reasonable time has passed, depending on the nature of the goods (e.g., an offer to sell fresh strawberries lapses much faster than an offer to sell a piece of land).
5. Failure of a Condition Precedent / Death:
If an offer is made subject to a specific condition (e.g., "subject to the vehicle passing its safety inspection") and that condition is not met, the offer lapses. Similarly, the death of either party before acceptance usually terminates the offer.
Key Takeaway for Offer: An offer is a firm proposal capable of immediate acceptance. Distinguish it carefully from an invitation to treat, and check whether a response is a counter-offer (which destroys the offer) or a simple request for information (which keeps the offer alive).
---2. Acceptance
What is Acceptance?
Acceptance is the final, unconditional assent to all the terms of an offer. English law applies the "mirror image rule": the acceptance must match the offer exactly. If it adds, changes, or removes a term, it is not an acceptance; it is a counter-offer.
Communication of Acceptance
As a general rule, an acceptance has no legal effect until it is actually communicated to the offeror. Key rules include:
1. Acceptance by Conduct:
Acceptance can be made orally, in writing, or implied by conduct (for example, taking delivery of goods and using them without objection).
2. Silence Cannot Be Imposed as Acceptance:
An offeror cannot force a contract onto someone by stating: "If I do not hear from you by Friday, I will consider you to have accepted my offer." Mental assent or pure silence is not sufficient; there must be an outward act or communication.
3. The Postal Rule (Letter of Acceptance):
This is a historic but vital exception to the rule that acceptance must be received. Under the postal rule:
• Where post is a reasonable and agreed method of communication, acceptance takes place the moment a properly addressed and stamped letter is placed into the post box, not when it arrives.
• The contract is formed at the moment of posting, even if the letter is delayed, lost, or never reaches the offeror at all!
Exam warning: The postal rule applies only to acceptance. It does not apply to offers, revocations, or rejections (which are only effective when actually received).
4. Instantaneous Communications (Email, Phone, Text, Messaging):
For modern, instantaneous methods of communication, the postal rule does not apply. Acceptance is effective only when it is actually received by the offeror (or arrives during normal business hours on their server/machine where it can reasonably be accessed).
Key Takeaway for Acceptance: Acceptance must mirror the terms of the offer precisely and must be communicated. Silence cannot amount to acceptance, and while the postal rule applies at the moment of posting, instantaneous communications require receipt.
---3. Consideration
What is Consideration?
English law does not enforce bare promises. If a friend promises to give you a free mobile phone and later changes their mind, you cannot sue them because you gave nothing in return. To make a promise enforceable, there must be consideration.
In simple terms, consideration is the price paid for the other party's promise. It represents an exchange of value: a benefit received by one party or a detriment suffered by the other.
The Fundamental Rules of Consideration
1. Consideration Must Be Sufficient, But Need Not Be Adequate:
• Sufficiency means the consideration must have some recognisable, real economic value in the eyes of the law (e.g., money, goods, services, or giving up a legal right).
• Adequacy refers to whether the exchange represents a fair market price or equal value. The courts will not interfere with a bad bargain: if someone agrees to sell an expensive sports car for just £1, that £1 is sufficient consideration even though it is completely inadequate compared to the car's actual market value.
2. Past Consideration is No Consideration:
Consideration must be given in exchange for the promise. If an act was already performed voluntarily in the past, and a promise to pay is made afterwards, that past act cannot count as consideration for the new promise.
Analogy: If you mow your neighbour's lawn as a kind, unsolicited favour on Saturday, and on Sunday your neighbour says, "Thank you, I will pay you £20 tomorrow," you cannot enforce that payment. The work was already completed before any promise was made!
3. Performance of an Existing Legal Duty:
Doing something that you are already legally obligated to do does not count as fresh consideration:
• Existing public duty: A police officer cannot claim a reward for solving a crime if doing so is part of their ordinary public duty.
• Existing contractual duty to the same party: Simply performing what you are already bound to do under an existing contract is generally not valid consideration for an additional payment promise, unless you exceed that duty or provide a practical commercial benefit without economic duress.
Key Takeaway for Consideration: Consideration requires an exchange of economic value. It must be sufficient (real) but does not need to be adequate (fair value), and past acts do not count as valid consideration.
---4. Legal Intention (Intention to Create Legal Relations)
Even if an offer, acceptance, and consideration exist, there is no contract unless both parties intend their agreement to be legally enforceable in a court of law. To assess this, the law applies two clear rebuttable presumptions:
1. Social and Domestic Agreements (Presumption: NO Intention)
Agreements made between family members, spouses, or friends are presumed not to be legally binding. The courts presume these arrangements rely on personal trust and affection rather than legal enforcement (for example, promises between parents and children regarding allowances or household chores).
Rebutting the presumption: This presumption can be displaced (overturned) by clear evidence showing the parties intended legal consequences, such as:
• Where a married couple is already separated or in the process of divorcing when making the financial agreement.
• Where significant money or property has been invested, or one party has acted to their heavy financial detriment relying on the promise.
• Where friends enter formal commercial syndicates (e.g., a written agreement to share lottery winnings).
2. Commercial and Business Agreements (Presumption: YES, Intention Exists)
Agreements made in a business or commercial context are presumed to have full legal intention. The courts assume business people intend their agreements to be enforceable.
Rebutting the presumption: This presumption is very strong, but it can be rebutted if the parties clearly and unambiguously state in writing that the agreement is not binding. Common phrases include:
• "Binding in honour only" (an honour clause).
• "Subject to contract" (meaning no legal obligations arise until formal contracts are drafted, agreed, and signed).
Key Takeaway for Legal Intention: The law presumes domestic and social promises lack legal intention, whereas commercial agreements possess it. Either presumption can be overturned with strong, objective evidence.
---5. Capacity
The final element of contract formation is capacity: the legal ability of a party to enter into a binding contract. The law provides special protection to certain vulnerable groups who might be easily exploited.
Minors (Individuals under the age of 18)
The general common law rule is that contracts entered into by minors are voidable or unenforceable against the minor. However, there are two important exceptions where a minor is bound:
1. Contracts for "Necessaries":
A minor is legally bound to pay a reasonable price for necessaries. Necessaries are goods and services suitable to the minor's condition in life and actual requirements at the time of sale (such as basic food, clothing, shelter, and medical care). If a minor already has an adequate supply of such items, additional purchases are not necessaries.
2. Beneficial Contracts of Service:
Contracts of employment, apprenticeships, or education and training entered into by a minor are valid and binding, provided the contract, taken as a whole, is for the minor's overall benefit.
Mental Incapacity and Intoxication
A contract made by a person who lacks mental capacity or is severely intoxicated by alcohol or drugs is valid and binding unless two conditions are proven:
1. At the time of making the contract, the person was incapable of understanding the nature of the transaction; and
2. The other party was aware, or ought reasonably to have been aware, of that incapacity.
If both elements are established, the contract is voidable at the option of the incapacitated or intoxicated person once they recover their faculties.
Key Takeaway for Capacity: Minors are protected from commercial liability except for necessaries and beneficial employment contracts. Mentally incapacitated or intoxicated parties must prove both lack of understanding and that the other party knew of their condition.
---Paper 2 Exam Application: Problem-Solving Checklist
When tackling a 20-mark scenario on contract formation in Paper 2, follow this step-by-step structure to secure top marks across all four assessment objectives (Knowledge, Application, Analysis, and Evaluation):
Step 1: Check the communications (Offer vs. Invitation to Treat)
Did the first party make an offer or merely an invitation to treat (e.g., an advert or shelf display)? Did the offer lapse, get revoked, or get destroyed by a counter-offer?
Step 2: Check the acceptance
Was there an unqualified acceptance matching the offer? Was it communicated properly? Did the postal rule apply, or was it an instantaneous communication?
Step 3: Check the consideration
Has each party provided something of economic value? Is the consideration past, or are they merely performing an existing duty?
Step 4: Check legal intention
Is the scenario set in a commercial or domestic context? Has either presumption been rebutted?
Step 5: Check capacity
Is either party an underage minor, intoxicated, or mentally incapacitated?
Step 6: Reach a clear, reasoned conclusion
Weigh the evidence objectively and conclude firmly whether an enforceable contract exists, and what practical remedies or rights flow from that finding.