The rationale for consideration | AQA A-Level Law
For Specification 7162
AQA A-Level Law | Free Revision Notes
Estimated study time: 30–40 minutes
Consideration is one of the essential requirements used by contract law to determine whether an agreement is legally enforceable. This The rationale for consideration A-Level Law revision page examines why the requirement exists, focusing on the idea of an exchange in which something is provided in return for a promise. It develops the voluntary and bargain-based ideas introduced in freedom of contract [Freedom of contract] and prepares you to study the relationship between consideration, privity and economic duress [Consideration, privity and economic duress].
Learning Objectives 🎯
By the end of this revision page, you should be able to:
Define consideration as an essential requirement of contract formation.
Explain consideration using the benefit and detriment approach.
Explain the idea of consideration as the price for which a contractual promise is obtained.
Explain the rationale for requiring something to be given in return for a promise.
Analyse why consideration must be sufficient but need not be adequate.
Analyse how the existence or absence of consideration affects contractual enforceability.
Revision Notes 📚
The rationale for consideration A-Level Law revision
AQA requires students to understand the rationale for consideration as part of the theory of contract law. Consideration is also separately identified as one of the essential requirements of contract, together with offer and acceptance and intention to create legal relations.
This creates two related areas of study:
Theory: Why does contract law require consideration?
Substantive law: What rules determine whether valid consideration exists?
This lesson concentrates on the first question. The detailed rules and their application are developed later in consideration [Consideration].
What is consideration?
Consideration is what one party gives or promises in return for the promise of the other party.
AQA examiner materials recognise two established ways of explaining the concept.
Benefit and detriment
Consideration may be understood by asking whether:
one party obtains a benefit, or
the other undertakes a detriment.
AQA examiner materials associate this approach with Currie v Misa.
The important idea is that the promise is connected with something being given, done or promised in return.
The price for the promise
A second formulation describes consideration as the price for which the promise of the other party is bought.
AQA's 2022 examiner report identifies this as an alternative recognised explanation of consideration.
This does not mean that consideration must literally be money.
The "price" may consist of:
an act
a promise
some other legally sufficient value supplied in return.
The key idea is exchange.
The bargain structure
Consideration helps identify the bargain underlying a contractual relationship.
Consider:
A promises to repair B's fence.
If nothing is provided in return, the promise raises a different question from:
A promises to repair B's fence in return for B promising to pay £300.
In the second arrangement:
A's promise to repair is made in return for B's promise to pay
B's promise to pay is made in return for A's promise to repair.
The promises form part of an exchange.
This can be represented as:
Party A's promise ⇄ Party B's consideration
and
Party B's promise ⇄ Party A's consideration
This reciprocal structure is central to the rationale of consideration.
Why does contract law require consideration?
The requirement helps contract law determine whether a promise forms part of an exchange capable of contractual enforcement.
AQA's specification places consideration within its analysis of the voluntary nature of contract, while the substantive specification identifies it as an essential requirement of formation.
Its rationale can therefore be understood through three connected ideas.
1. Consideration identifies an exchange
The requirement asks what was provided in return for a promise.
This helps establish that the promise is part of a bargain between the parties rather than simply examining the promise in isolation.
2. Consideration connects the parties' obligations
Each party's promise or performance can provide the basis for the obligation undertaken by the other.
The parties are not simply making unrelated statements. Their obligations are connected through the exchange.
3. Consideration contributes to enforceability
AQA mark schemes repeatedly describe consideration as one of the elements required for a valid contract.
If the required consideration cannot be established, the relevant promise may not be contractually enforceable.
Consideration therefore performs a gatekeeping role within formation.
Consideration and voluntary contracting
Consideration connects closely with the voluntary nature of a contract.
In an ordinary bilateral contract, the parties determine what each will provide in return for the other's promise.
For example:
Nadia promises to design a website for Oliver.
Oliver promises to pay Nadia £1,000.
Each party has voluntarily undertaken an obligation because of what the other has agreed to provide.
Consideration therefore complements freedom of contract [Freedom of contract]:
the parties choose whether to contract
they choose the obligations they undertake
consideration identifies the exchange forming part of that bargain
contract law may then enforce the obligations where the formation requirements are satisfied.
Consideration is not the same as agreement
Do not confuse consideration with offer and acceptance.
Offer and acceptance establish whether the parties have reached an agreement.
Consideration asks whether the required exchange exists in support of the promises.
The formation requirements can therefore be viewed as separate questions:
Requirement | Central question |
Offer and acceptance | Have the parties reached agreement? |
Consideration | What has been given or promised in return? |
Intention to create legal relations | Was the agreement intended to create legal consequences? |
An agreement may therefore appear clear while consideration remains a separate issue.
This distinction becomes important when you later study intention to create legal relations [Intention to create legal relations].
Consideration must be sufficient
AQA assessment materials repeatedly refer to the rule that consideration must be sufficient.
This means that the consideration must possess some legally recognised value.
The 2023 examiner report explained sufficiency as requiring some substance or value, even where that value is very small.
This reflects the underlying rationale.
If consideration is supposed to identify what has been provided in return for a promise, there must be something capable of amounting to consideration.
Consideration need not be adequate
Although consideration must be sufficient, it does not need to be adequate.
Adequacy concerns whether the values exchanged are equivalent or proportionate.
Contract law does not generally require:
$$\text{Value supplied by Party A} = \text{Value supplied by Party B}$$
AQA's 2024 examination directly tested the incorrect suggestion that consideration supplied by each party must be approximately equal in value. The examiner report confirmed that equivalence is not required because consideration need not be adequate.
For example:
Priya agrees to carry out work normally worth far more than the £20 voucher promised by Ravi.
The large difference in economic value does not automatically mean there is no consideration.
The correct question is first whether the consideration is sufficient, not whether the bargain appears financially equal.
Why does adequacy not normally matter?
This rule can be linked to freedom of contract.
If parties are generally free to determine their own bargain, the courts do not normally need to insist that the exchange must be economically equal.
The parties themselves decide what obligations they are prepared to undertake.
This gives us an important connection:
freedom of contract → parties determine their bargain
consideration → law requires sufficient exchange
no adequacy requirement → law does not generally insist on equal economic value
The law therefore checks for the existence of consideration without simply replacing the parties' own assessment of the bargain with the court's assessment of whether it was a good deal.
Thomas v Thomas and Chappell v Nestlé
AQA examiner materials identify Thomas v Thomas and Chappell v Nestlé as authorities commonly used to support the distinction between sufficiency and adequacy.
For this lesson, their importance is theoretical:
consideration must contain something of legally recognised value, but it does not need to equal the value of what is received in return.
Do not turn a theory question about the rationale for consideration into a long account of individual cases.
Use legal authority to support the principle and then return to the question of why the requirement matters.
AQA example: a £10 voucher for substantial work
The 2023 examination provides a useful illustration.
Karol agreed to carry out significant gardening work for Lewis in return for a £10 gift voucher.
The examiner report explained that the voucher could still amount to sufficient consideration despite its minimal value when compared with the gardening work.
The legal point is not:
"£10 is a fair price for substantial gardening work."
Instead:
The law does not generally require proportional value. The voucher possessed some value, so the considerable difference between the two sides of the bargain did not itself prevent valid consideration.
This demonstrates the difference between legal sufficiency and economic adequacy.
Consideration and enforceability
Consideration matters because an apparently clear promise may not be enforceable in contract unless consideration can be identified.
The structure is:
promise + required consideration + other formation requirements → potentially enforceable contractual obligation
If consideration is absent:
promise without required consideration → difficulty establishing contractual enforceability
AQA's 2022 mark scheme expressly treated proof of consideration as necessary in determining whether Matt had contractual rights against Nirmal.
This demonstrates consideration's practical role.
It is not simply terminology to memorise. It determines whether contract law recognises a particular promise as part of an enforceable bargain.
Why timing matters to the rationale
The requirement that consideration is provided in return for a promise also explains the significance of past consideration.
Suppose:
Amir voluntarily repairs Becca's gate.
Only afterwards, Becca says, "I promise to pay you £100 for what you did."
The repair happened before and without reference to Becca's later promise.
The problem is therefore not simply chronological.
The deeper issue is:
Was the act performed in return for the promise?
If it was performed independently before the promise existed, it may not represent the exchange that consideration is designed to identify.
AQA's 2024 mark scheme expresses the principle directly: consideration must be given in return for a promise, so something done beforehand and without reference to that promise is not normally good consideration.
The rationale for the past consideration rule
This makes the past consideration rule easier to understand.
A student might memorise:
"Past consideration is not good consideration."
A stronger student can explain why.
If the act was already completed independently of the later promise, it may not have been performed as the price for that promise.
There is therefore no obvious exchange:
earlier voluntary act ✕ later unrelated promise
Compare:
promise ⇄ act supplied in return
The second arrangement fits the rationale of consideration much more clearly.
The 2024 examiner report specifically required students to explain the nature of past consideration and the rationale for why it is not sufficient consideration.
When an apparently past act may still form part of the exchange
AQA materials also recognise that an act performed before an express promise may not truly be "past" where:
it was performed following an express or implied request
the circumstances carried an understanding that payment or another return would be provided
a later promise makes that earlier understanding specific.
Authorities such as Lampleigh v Braithwait and Re Casey's Patents are identified by AQA in this context.
The theoretical significance is important.
The law is not simply obsessed with whether the promise and act occurred in a particular order.
It is trying to determine whether the act was genuinely part of the exchange surrounding the promise.
A worked comparison
Consider two scenarios.
Scenario A
Leah paints Maya's fence without being asked.
Three days later Maya says:
"That was kind of you. I promise to pay you £100."
The painting was completed independently of Maya's promise.
It is therefore difficult to say that Leah painted the fence in return for the promise to pay £100.
Scenario B
Maya asks Leah to paint the fence in circumstances showing that the work will be paid for.
Leah paints it.
Afterwards Maya confirms:
"I will pay you £100."
Although the express amount is stated afterwards, the original request and understanding may show that the work was part of an exchange from the outset.
This comparison demonstrates the underlying rationale more clearly than memorising the label "past consideration".
Consideration and bilateral contracts
A bilateral contract commonly involves an exchange of promises.
For example:
Olivia promises to pay £500.
Pavel promises to carry out specified work.
Olivia does not need to wait until Pavel finishes the work before her promise can be supported by consideration.
Pavel's promise to perform can itself form part of the contractual exchange.
This is important because AQA's 2023 examiner report identified a serious misunderstanding among students who thought work became "past consideration" simply because payment was due after the work had been performed.
The correct reasoning is:
the parties exchanged promises when forming the contract
each promise can support the other
later performance of those promises does not automatically turn the original consideration into past consideration.
Consideration does not require money
Another misunderstanding is to equate consideration with money.
AQA assessment material expressly recognises that consideration may consist of an act in return for a promise.
It can therefore involve:
a promise to pay
a promise to provide services
carrying out an act
another form of legally sufficient value.
The key is the exchange, not the use of cash.
Consideration as a filter for enforceable promises
The rationale can be viewed as giving consideration a filtering function.
Contract law does not look only for:
"Did somebody make a promise?"
It also asks:
"What was provided or promised in return?"
This means consideration helps identify promises that form part of a reciprocal contractual bargain.
However, consideration is not the only filter.
A valid contract also requires the other essential requirements specified by AQA.
For example, even where consideration exists, the parties may still need to establish intention to create legal relations [Intention to create legal relations].
Is consideration concerned with fairness?
Not primarily.
The rule that consideration need not be adequate shows that consideration does not normally ask whether the bargain is economically equal.
A person may knowingly agree to exchange something valuable for something of much smaller monetary value.
The role of consideration is instead to establish the necessary exchange or bargain.
This is an important distinction:
Question | Does consideration generally answer it? |
Has something sufficient been supplied in return? | Yes |
Are both sides worth exactly the same amount? | No |
Has an exchange supporting the promises been identified? | Yes |
Is the bargain financially sensible for both parties? | Not the central consideration question |
Strengths of the requirement for consideration
The rationale can be analysed positively.
It identifies reciprocity
Consideration demonstrates that promises are connected through an exchange.
It assists determination of enforceability
Courts can ask what each party supplied in return for the other's promise.
It fits freedom of contract
The law recognises bargains chosen by the parties without generally demanding equal economic value.
It provides a framework for analysing promises
Rules such as sufficiency, adequacy and past consideration help determine whether the required bargain exists.
Difficulties with the requirement
The rules can nevertheless create complicated distinctions.
For example:
something may have very little economic value but still be sufficient
a valuable act may fail as consideration if it was genuinely completed before and independently of the promise
an apparently past act may nevertheless be treated differently where an earlier request and expectation of payment connect it with the later promise.
These distinctions demonstrate why students must understand the rationale, not just memorise individual rules.
If the central idea is understood as something being provided in return for a promise, many of the substantive rules become easier to explain.
Consideration and privity
AQA expressly requires the relationship between consideration and privity in the next stage of theory.
The connection arises because contractual rights traditionally relate closely to participation in the contractual bargain and the provision of consideration.
AQA mark scheme material states the basic privity rule in terms of parties to a contract, and those supplying consideration, acquiring contractual rights and duties, subject to relevant exceptions.
This relationship is developed fully in consideration, privity and economic duress [Consideration, privity and economic duress] and later in privity of contract [Privity of contract].
Consideration and economic duress
Consideration also connects with economic duress.
A person may apparently provide consideration for a new promise, but a separate question can arise about whether that contractual change resulted from improper economic pressure.
AQA specifically requires students to understand this relationship.
This reinforces an important lesson:
Consideration helps establish an exchange, but the existence of an exchange does not answer every question about contractual enforceability.
Other contractual principles may still need to be considered.
The detailed relationship is the focus of consideration, privity and economic duress [Consideration, privity and economic duress].
An exam framework for the rationale of consideration
If asked to explain or analyse the rationale for consideration, use this sequence.
1. Define consideration
Explain that it concerns something supplied in return for another party's promise.
You may use the benefit/detriment formulation or the idea of the price for which the promise is obtained.
2. Explain its place in formation
Consideration is one of the essential requirements of contract.
3. Explain the bargain rationale
The requirement identifies an exchange between the parties rather than examining an isolated promise.
4. Explain sufficiency
Something of legally recognised value must be provided.
5. Explain why adequacy is unnecessary
The parties generally determine the value of their own bargain.
6. Use past consideration to demonstrate the rationale
Something already done independently of a promise is not normally consideration because it was not supplied in return for that promise.
7. Reach a conclusion on enforceability
Explain how the requirement helps determine which promises contract law will recognise as enforceable.
From rule-learning to analysis
Compare these responses.
Descriptive
Consideration must be sufficient but need not be adequate. Past consideration is not good consideration.
Analytical
The rules reflect the rationale that consideration identifies an exchange supporting contractual promises. Requiring sufficiency ensures that something capable of amounting to consideration has been provided, while refusing to demand adequacy respects the parties' freedom to value their own bargain. Past consideration normally fails because an act completed independently before a promise cannot readily be described as something supplied in return for that promise.
The second version answers why the rules exist.
That is what this theory lesson requires.
Key Words 🔑
Key word | Student-friendly definition | How it may be used in an exam |
Consideration | Something of legally recognised value given or promised in return for another party's promise. | Use it when determining whether a promise forms part of an enforceable contractual bargain. |
Sufficient | Having some legally recognised value capable of amounting to consideration. | Use it when deciding whether what a party provided can support the other party's promise. |
Adequate | Equal or proportionate in economic value to what is received in return. | Explain that consideration does not normally need to be adequate. |
Past consideration | An act performed before and independently of the promise later relied upon. | Use it when analysing whether an act was genuinely supplied in return for the promise. |
Enforceability | The ability to have a contractual obligation recognised and enforced by law. | Use it to explain why the requirement for consideration matters within contract formation. |
Hints from the Examiner Reports 💡
Examiner hint: Know the difference between sufficiency and adequacy. The 2022 report found that most students knew consideration need not be equal in value, but fewer successfully applied that principle to the actual facts. Always identify what each party provides before considering whether it is sufficient.
Examiner hint: Focus on the specific consideration issue. In 2023, some students explored almost every rule on consideration when the real issue was simply adequacy and sufficiency. This reduced the quality of their response to the point actually being tested.
Examiner hint: Do not label something "past consideration" without explaining why. The 2022 report criticised answers that merely asserted that consideration was past instead of showing that the act occurred before and without reference to the later promise.
Examiner hint: In past consideration problems, connect the act to the promise. The 2024 report found that many students struggled to explain how an earlier request and implied expectation of payment could connect the work with the later express promise.
Examiner hint: Do not confuse later performance with past consideration. The 2023 examiner report identified as a fundamental misunderstanding the suggestion that work became past consideration merely because payment would be made after the work was completed. In a bilateral contract, the parties may already have exchanged enforceable promises.
Common Mistakes ⚠️
Mistake: Defining consideration as money
Why this is incorrect: Consideration does not have to consist of payment. It can include an act or promise supplied in return for another promise.
How to improve: Think in terms of exchange, not cash.
Mistake: Saying both sides must provide things of equal value
Why this is incorrect: Consideration must be sufficient but need not be adequate.
How to improve: Ask whether what has been supplied has some legally recognised value, not whether the bargain appears financially equal.
Mistake: Treating consideration and agreement as the same requirement
Why this is incorrect: Offer and acceptance establish agreement. Consideration concerns what has been provided in return for a contractual promise.
How to improve: Keep the essential formation requirements separate and answer only the one raised by the facts.
Mistake: Memorising "past consideration is not good consideration" without understanding why
Why this is incorrect: The rule reflects the requirement that consideration must be supplied in return for the promise.
How to improve: Ask whether the act was connected to the promise as part of an exchange.
Mistake: Assuming low-value consideration is invalid
Why this is incorrect: The fact that one side of a bargain is worth much less than the other does not automatically prevent valid consideration.
How to improve: Distinguish low value from no sufficient value.
Mistake: Calling performance past consideration simply because it occurs before payment
Why this is incorrect: The relevant question is when the contractual promises were exchanged, not merely when physical performance or payment later occurs.
How to improve: Identify the consideration at the moment the bargain was formed.
Exam-Style Questions ✍️
Question 1
Which one of the following best describes the role of consideration?
A. It ensures every contractual bargain has equal economic value.
B. It identifies something supplied in return for a contractual promise.
C. It proves that every agreement is legally enforceable.
D. It requires every contract to involve payment of money.
[1 mark]
Question 2
State two recognised ways of explaining consideration.
[2 marks]
Question 3
Explain the distinction between sufficient and adequate consideration.
[4 marks]
Question 4
Amina promises to carry out substantial work for Ben. In return, Ben promises Amina a £20 voucher.
Explain why the difference in economic value does not necessarily prevent Ben's promise from providing valid consideration.
[5 marks]
Question 5
Cara voluntarily repairs Dan's bicycle without being asked. The following day Dan promises to pay Cara £100 because he is pleased with the repair.
Using the rationale for consideration, explain why Cara may have difficulty enforcing Dan's promise.
[5 marks]
Question 6
Eva promises to pay Farid £600 in return for Farid promising to decorate her flat. Farid will complete the work before Eva is required to make payment.
Farid later argues that his work cannot be consideration because it will have been completed before Eva actually pays him.
Analyse Farid's argument.
[10 marks]
Question 7
Gia agrees to undertake work of substantial value in return for Hari promising her an item of much smaller financial value.
Analyse how the rules on consideration reflect the principle of freedom of contract.
[10 marks]
Question 8
Isaac carries out emergency work for Jaya. Jaya did not expressly ask Isaac to do the work, but they have a history of Isaac undertaking similar paid work for her. When Jaya returns, she promises to pay Isaac £150.
Explain how the rationale for consideration would help a court analyse whether Isaac's work can support Jaya's promise.
[10 marks]
Question 9
Examine the rationale for consideration and analyse its role in determining whether contractual promises are enforceable.
[15 marks]
Answers and mark scheme
Question 1
Answer: B
Consideration identifies something provided or promised in return for another contractual promise.
1 mark
Question 2
Award 1 mark each for:
the benefit/detriment approach
consideration as the price for which the other party's promise is obtained.
Maximum: 2 marks
Question 3
Indicative content:
Consideration must be sufficient, meaning that there must be something of legally recognised value.
Consideration need not be adequate.
Adequacy concerns equality or proportionality in economic value.
The parties' consideration therefore need not be approximately equal in value.
Maximum: 4 marks
Question 4
Indicative content:
Consideration does not need to be economically equal on both sides.
It must instead be sufficient.
The £20 voucher possesses some value.
The fact that Amina's work may be worth substantially more does not by itself invalidate the consideration.
This reflects the parties' freedom to determine their own bargain.
Maximum: 5 marks
Question 5
Indicative content:
Consideration must be supplied in return for the promise.
Cara repaired the bicycle before Dan made his promise.
She acted voluntarily and independently of that promise.
The work therefore appears to be past consideration.
The rationale is that the repair cannot readily be characterised as the price for Dan's later promise because it was not performed in return for it.
Maximum: 5 marks
Question 6
Indicative content:
Eva and Farid exchanged promises when making their agreement.
Eva promised £600.
Farid promised to decorate the flat.
Each promise can form part of the consideration for the other.
The later timing of actual performance does not make Farid's consideration "past".
Farid's argument confuses performance of the contractual obligation with the point at which the consideration was exchanged.
The 2023 examiner report identifies this type of reasoning as a misunderstanding of consideration in bilateral contracts.
Conclusion: Farid's argument is unlikely to be correct on these facts.
Maximum: 10 marks
Question 7
Indicative content:
Consideration must be sufficient but need not be adequate.
Hari must provide something capable of amounting to consideration.
The law does not generally require equivalence between the economic value supplied by each party.
This reflects freedom of contract because Gia and Hari determine the bargain they are willing to make.
The court's role is not simply to substitute its own assessment of whether Gia made a financially sensible bargain.
Requiring sufficiency still places a legal limit on contractual freedom because some consideration must exist.
The rule therefore combines freedom to value the bargain with a legal requirement for an identifiable exchange.
Maximum: 10 marks
Question 8
Indicative content:
Consideration normally has to be supplied in return for a promise.
Isaac's work occurred before Jaya's express promise to pay £150.
Prima facie, this suggests past consideration.
However, the earlier relationship may support an argument that there was an implied request for such work.
Their history of paid work may also support an implied expectation that Isaac would be compensated.
Jaya's later express promise may then make the earlier understanding specific.
The rationale is to determine whether the work was genuinely part of an exchange rather than an independent voluntary act.
Relevant AQA authorities include Lampleigh v Braithwait and Re Casey's Patents.
A reasoned conclusion should recognise that the facts permit argument on both sides.
Maximum: 10 marks
Question 9
Indicative content may include:
consideration as an essential requirement of contract formation
the benefit/detriment explanation
consideration as the price for which another promise is obtained
consideration as evidence of an exchange or reciprocal bargain
the connection between consideration and the voluntary nature of contract
the requirement for sufficient consideration
the rule that consideration need not be adequate
the relationship between non-adequacy and freedom of contract
the fact that economically unequal exchanges may still contain valid consideration
the rationale for the past consideration rule
the requirement that an act be supplied in return for the relevant promise
circumstances in which an apparently past act may be linked to an earlier request and understanding of payment
the role of consideration in determining whether a promise is contractually enforceable
the fact that consideration is not the only formation requirement
the forthcoming relationships between consideration, privity and economic duress.
A high-level response should not simply list rules. It should explain how those rules reflect the underlying rationale of identifying an exchange supporting contractual promises.
A substantiated conclusion could argue that consideration plays an important role in contractual enforceability because it connects promises to a reciprocal bargain. The rules on sufficiency, adequacy and past consideration can therefore be understood as attempts to determine whether something has genuinely been supplied in return for the promise while preserving substantial freedom for parties to determine the economic value of their own bargain.
Maximum: 15 marks
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