# How does offer differ from invitation to treat?
Introduction
For a legally binding contract to exist in England and Wales, there must be a clear offer which is met with an unqualified acceptance. A crucial first step in contract formation is therefore distinguishing a genuine offer from an “invitation to treat” (ITT). An offer is a definite promise to be bound by specified terms, requiring only a “yes” from the offeree to create a contract. An invitation to treat, by contrast, is a preliminary step, inviting others to make an offer or to enter into negotiations. The fundamental difference lies in the intention of the party making the statement: do they intend to be bound immediately upon acceptance, or do they wish to retain the ability to negotiate or refuse? This essay will explain this distinction using key case law concerning common commercial situations.
The Importance of Intention and Certainty
The courts look for objective evidence of an intention to be bound. The language used is therefore critical. A statement that is too vague or leaves key terms open for discussion will be considered an invitation to treat, not an offer. The case of *Gibson v Manchester City Council* (1979) illustrates this principle. The council wrote to Mr Gibson stating it “may be prepared to sell” his council house to him. The House of Lords held that this language was not sufficiently definite to be an offer; it was merely an invitation for Mr Gibson to make a formal application, which would be his offer. There was no intention to be bound by the council’s letter. This contrasts with the earlier case of *Storer v Manchester City Council* (1974), where the council sent a document titled “Agreement for Sale” which the claimant signed and returned. The Court of Appeal found that this was a sufficiently clear offer from the council which the claimant had accepted, creating a binding contract. The difference in wording demonstrated a different level of intention.
Advertisements and Displays of Goods
To provide certainty in everyday commerce, the law has developed general rules or ‘presumptions’ for common scenarios like advertisements and goods displayed in shops. The general rule is that these are invitations to treat, not offers. In *Partridge v Crittenden* (1968), the defendant was charged with ‘offering for sale’ a wild bird, contrary to statute. His conviction was overturned because the court held that his newspaper advertisement was an invitation to treat. The court reasoned that if it were an offer, the advertiser might find themselves contractually obliged to sell to everyone who accepted, potentially exceeding their stock. This is known as the ‘limited stock’ argument and is based on commercial common sense.
However, this presumption can be rebutted. An advertisement may be interpreted as a unilateral offer if it shows a clear intention to be bound and asks for performance of an act. In the famous case of *Carlill v Carbolic Smoke Ball Co* (1893), the company placed an advertisement promising to pay £100 to anyone who caught influenza after using their product as directed. The company stated it had deposited £1,000 in a bank to “show our sincerity”. The Court of Appeal held that this was not a mere ITT but a unilateral offer to the world. The deposit of money showed a clear intention to be bound, and acceptance was completed by performing the conditions, meaning Mrs Carlill was entitled to the £100.
Similarly, goods displayed in a shop are considered invitations to treat. In *Pharmaceutical Society of Great Britain v Boots Cash Chemists* (1953), the court had to decide when the sale of medicines took place in a self-service pharmacy. It was held that the display of goods on shelves was an ITT. The customer makes the offer when they present the items at the till, and the cashier accepts that offer by scanning the items and taking payment. This protects the shopkeeper’s freedom to refuse a sale and allows the customer to change their mind and return an item to the shelf before reaching the checkout. This was also the finding in *Fisher v Bell* (1961), where a flick-knife displayed in a shop window with a price tag was held to be an ITT, not an offer for sale.
Conclusion
In conclusion, the distinction between an offer and an invitation to treat is fundamental to contract law and hinges on the maker’s intention to be bound. An offer is a firm proposal, while an invitation to treat is simply an expression of willingness to negotiate. While the principle is clear, its application has led to the establishment of practical presumptions for situations like advertisements and shop displays, as seen in cases like *Partridge v Crittenden* and *Boots*. These rules generally categorise such displays as invitations to treat to protect commercial freedom and practicality. However, as the contrasting case of *Carlill v Carbolic Smoke Ball Co* demonstrates, these presumptions can always be displaced by evidence of a clear intention to be bound, which remains the ultimate test.
References
- *Carlill v Carbolic Smoke Ball Co* [1893] 1 QB 256
- *Fisher v Bell* [1961] 1 QB 394
- *Gibson v Manchester City Council* [1979] 1 WLR 294
- *Partridge v Crittenden* [1968] 1 WLR 1204
- *Pharmaceutical Society of Great Britain v Boots Cash Chemists (Southern) Ltd* [1953] 1 QB 401
- *Storer v Manchester City Council* [1974] 1 WLR 1403
