Understanding Consideration in Contract Law

When studying for your law degree or preparing for the SQE, mastering the concept of consideration in contract law is absolutely essential. Consideration is one of the three fundamental pillars of a legally binding contract in English law, alongside offer and acceptance, and an intention to create legal relations. Without consideration, a promise is generally unenforceable, making it a critical doctrine for any aspiring lawyer to understand thoroughly. In this comprehensive guide, we will explore the intricacies of consideration in contract law, examining the key principles, landmark cases, and the practical application of these rules. Whether you are revising for exams or seeking to deepen your understanding, this article will provide you with the clarity you need.

What is Consideration in Contract Law?

At its core, consideration in contract law refers to the "price" paid for a promise. It is the concept of mutuality or exchange; each party to a contract must provide something of value to the other. Sir Frederick Pollock famously defined consideration as "an act or forbearance of one party, or the promise thereof, is the price for which the promise of the other is bought, and the promise thus given for value is enforceable." This definition was adopted by the House of Lords in the landmark case of Dunlop Pneumatic Tyre Co Ltd v Selfridge & Co Ltd [1915].

In simpler terms, if Party A promises to wash Party B's car, Party B must provide something in return—such as a promise to pay £10—for Party A's promise to be legally binding. If Party B offers nothing in return, Party A's promise is merely a gratuitous promise (a gift) and cannot be enforced in court. Understanding this basic premise is the first step to mastering consideration in contract law.

The Rules of Consideration

To apply the doctrine of consideration in contract law effectively, you must understand the established rules that govern it. These rules have been developed through centuries of common law and dictate what constitutes valid consideration.

Consideration Must Move from the Promisee

For a person to enforce a promise, they must have provided consideration for it. This rule is closely linked to the doctrine of privity of contract. If Party A promises Party B that they will pay £100 to Party C, Party C cannot generally enforce this promise because they have not provided any consideration. The consideration must move from the person to whom the promise was made (the promisee). This principle was clearly illustrated in Tweddle v Atkinson (1861), where a son could not enforce a promise made between his father and father-in-law to pay him a sum of money upon his marriage, as he had provided no consideration for the promise.

Consideration Must Not Be Past

One of the most frequently tested areas of consideration in contract law is the rule against past consideration. Consideration must be given in exchange for the promise. If an act has already been performed before the promise is made, it is considered "past consideration" and is not valid.

A classic example is Re McArdle (1951). In this case, a woman carried out repairs on a house. After the work was completed, the beneficiaries of the house promised to pay her for the repairs. The court held that the promise was unenforceable because her consideration (the repairs) was past; it had been completed before the promise to pay was made.

However, there is an important exception to this rule, known as the doctrine of implied assumpsit, established in Lampleigh v Brathwait (1615) and refined in Pao On v Lau Yiu Long [1980]. Past consideration may be valid if:

1. The act was done at the promisor's request.
2. It was understood that the act would be remunerated in some way.
3. The promise would have been legally enforceable had it been made in advance.

Consideration Must Be Sufficient but Need Not Be Adequate

This is perhaps the most famous rule of consideration in contract law. "Sufficiency" means that the consideration must have some value in the eyes of the law, no matter how small. "Adequacy" refers to the commercial value of the consideration. The courts will not inquire into whether a contract is a good bargain; they only care that something of legal value has been exchanged.

The principle that consideration need not be adequate is perfectly demonstrated by Chappell & Co Ltd v Nestlé Co Ltd [1960]. Nestlé offered a record to customers who sent in 1s 6d and three chocolate bar wrappers. The House of Lords held that the wrappers formed part of the consideration, even though they were of trivial economic value and were thrown away upon receipt. As Lord Somervell noted, "A peppercorn does not cease to be good consideration if it is established that the promisee does not like pepper and will throw away the corn."

Performance of an Existing Duty

A complex area of consideration in contract law arises when a party promises to do something they are already legally bound to do. Does this constitute valid consideration for a new promise? The answer depends on the nature of the existing duty.

Existing Public Duty

If a person is merely performing a duty imposed on them by law, this is not valid consideration. In Collins v Godefroy (1831), a police officer was promised payment to attend court and give evidence. Since he was already under a legal duty to attend by subpoena, his attendance was not good consideration for the promise of payment. However, if a person exceeds their public duty, this extra effort can constitute valid consideration, as seen in Glasbrook Bros Ltd v Glamorgan County Council [1925], where the police provided a special garrison beyond their normal duties.

Existing Contractual Duty to the Promisor

Historically, performing an existing contractual duty owed to the promisor was not good consideration for a new promise. In Stilk v Myrick (1809), sailors were promised extra wages to sail a ship back to London after two crew members deserted. The court held they provided no consideration for the extra pay because they were already contractually bound to sail the ship back in emergencies.

However, the law evolved significantly with the landmark case of Williams v Roffey Bros & Nicholls (Contractors) Ltd [1991]. The Court of Appeal held that if the promisor obtains a "practical benefit" or avoids a disbenefit from the promisee's continued performance of their existing duty, this can constitute valid consideration, provided there is no economic duress or fraud. This case fundamentally shifted the landscape of consideration in contract law.

Part Payment of a Debt

The rule in Pinnel's Case (1602) states that part payment of a debt is not valid consideration for a promise to forgo the balance. If you owe someone £100 and they agree to accept £80 in full settlement, they can still sue you for the remaining £20, because you provided no consideration for their promise to forgive the rest. This was affirmed by the House of Lords in Foakes v Beer (1884).

Exceptions exist, such as if the part payment is made early, in a different place, or with a different item (e.g., a horse instead of money), as this introduces new consideration.

Promissory Estoppel

When discussing consideration in contract law, one must also address the equitable doctrine of promissory estoppel. This doctrine serves as a shield to prevent a party from going back on a promise, even if no consideration was provided, where it would be inequitable to do so.

Developed by Lord Denning in Central London Property Trust Ltd v High Trees House Ltd [1947], promissory estoppel requires:

1. A pre-existing legal relationship.
2. A clear and unequivocal promise that strict legal rights will not be enforced.
3. Reliance on the promise by the promisee (altering their position).
4. It must be inequitable for the promisor to go back on their promise.

Promissory estoppel is a vital equitable exception to the strict common law rules of consideration, providing fairness where the rigid application of contract law might cause injustice.

Practical Advice for Law Students

When tackling problem questions or essays on consideration in contract law, structure is key. Always start by identifying the promise that needs to be enforced. Then, look for the consideration provided in exchange for that specific promise.

1. Identify the Promisor and Promisee: Who is making the promise, and who is trying to enforce it?
2. Apply the Rules: Systematically check if the consideration is past, if it moves from the promisee, and if it is sufficient.
3. Check for Existing Duties: If the consideration involves an existing duty, carefully apply Stilk v Myrick and Williams v Roffey Bros. Always consider whether a practical benefit has been conferred.
4. Consider Estoppel: If there is no valid consideration, particularly in debt modification scenarios, evaluate whether promissory estoppel could apply as a defence.

By methodically applying these principles, you can construct a robust and legally sound argument. If you find yourself struggling with these concepts, seeking guidance from a Link: /private-law-tutor-uk can provide the tailored support you need to excel.

Frequently Asked Questions

What is the difference between sufficiency and adequacy of consideration?

Sufficiency means the consideration must have some legal value, however small. Adequacy refers to the commercial or market value of the consideration. The law requires consideration to be sufficient, but it does not need to be adequate. The courts will not intervene just because someone made a bad bargain.

Can past consideration ever be valid?

Generally, past consideration is not valid. However, under the doctrine of implied assumpsit, it can be valid if the act was done at the promisor's request, there was an understanding that it would be rewarded, and the promise would have been enforceable if made in advance.

How does Williams v Roffey Bros affect the rule in Stilk v Myrick?

Stilk v Myrick established that performing an existing contractual duty is not good consideration. Williams v Roffey Bros introduced an exception: if performing the existing duty provides a "practical benefit" to the promisor (and there is no duress), it can constitute valid consideration.

Does promissory estoppel create a new cause of action?

No, promissory estoppel is a shield, not a sword. It can only be used as a defence to prevent a party from enforcing their strict legal rights; it cannot be used to create a new contract or a new cause of action where none existed.

Master Contract Law with Expert Guidance

Understanding the nuances of consideration in contract law is crucial for achieving top marks in your LLB or SQE exams. While textbooks provide the foundation, applying these principles to complex problem questions requires analytical skill and practice. If you want to elevate your understanding and refine your exam technique, consider working with an expert Link: /llb-tutor-uk or a dedicated Link: /private-sqe-tutor.

At The Law Tutors, we offer bespoke tutoring designed to help you navigate the complexities of English law. Whether you need a comprehensive Link: /law-revision-tutor-uk or targeted support for specific modules, our experienced barristers and academics are here to help. Link: /find-a-tutor today to discover how we can support your legal education journey, and be sure to explore our Link: /blog for more insights and study tips.