
Promises are an essential aspect of contract law, encompassing both written and oral commitments. A contract can be understood as a promise or a set of promises that are legally enforceable or recognised as a duty. The concept of a return promise falls under the domain of contract law and refers to a situation where promises are made in exchange for other promises or performances. This reciprocal nature distinguishes return promises from unilateral contracts, where no promise is received as consideration. In the context of contract law, a promise may be enforceable if the promisee has incurred costs or conferred benefits based on the promise. However, not all promises, regardless of how solemnly made, are legally enforceable, and the determination of enforceability involves a complex interplay of doctrinal categories and principles, such as quasi-contracts and unjust enrichment.
| Characteristics | Values |
|---|---|
| Definition | A contract is a promise or a set of promises for the breach of which the law gives a remedy, or the performance of which the law in some way recognizes as a duty. |
| Binding | A promise is binding if injustice can be avoided only by enforcement of the promise. |
| Types | Contracts can be unilateral or bilateral. |
| Unilateral Contract | A "unilateral contract" is one in which no promisor receives a promise as consideration. |
| Bilateral Contract | A "bilateral contract" is one in which there are mutual promises between the two parties to the contract. |
| Quasi-Contract | A quasi-contract has no reference to the intentions or expressions of the parties. The obligation is imposed despite, and frequently in frustration of, their intention. |
| Enforceability | Not all promises are legally binding or enforceable. |
| Common Law "Bargain Theory" | Bargained-for promises are presumptively enforceable; nonreciprocal promises are presumptively unenforceable. |
| Additional Principles of Promissory Obligation | Reliance and unjust enrichment. |
| Consideration | A valuable consideration may consist of a benefit accruing to one party or a detriment suffered by the other party. |
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What You'll Learn

Unilateral vs bilateral contracts
Unilateral contracts and bilateral contracts are two types of agreements that business professionals encounter daily. They differ in the number of parties making promises and the nature of those promises.
Unilateral contracts involve one party making a promise to a general group of people. The other party accepts the promise by completing the requested action, not by making a return promise. For example, you may offer to reward someone for finding your lost pet. If that person finds and returns your pet, you must fulfil your end of the agreement by paying the reward. In this scenario, the non-promising party has no legal obligation to perform and only becomes involved in the contract if they choose to complete the requested action. Unilateral contracts are more flexible, as the offering party has the right to revoke their offer before the other party accepts it by performing the required action.
On the other hand, bilateral contracts involve mutual promises and obligations between two parties, creating legal obligations for both to fulfil their respective commitments. Both parties must agree on all the contract's essential terms before it becomes binding. For example, when you dine at a restaurant, you implicitly enter into a bilateral contract. By ordering a meal, you promise to pay for the food, and the restaurant promises to provide the meal in exchange for payment. Although no formal contract is signed, the actions of both parties constitute a binding agreement recognised by the courts.
While bilateral agreements are widely used in business transactions, unilateral contracts are more common in everyday dealings. Bilateral contracts provide more legal remedies for both parties in case of a breach, whereas in a unilateral contract, the other party cannot sue for the specific performance of the contract since only one party is bound.
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Quasi-contracts
The key elements of a quasi-contract are:
- A benefit is conferred upon the defendant by the plaintiff.
- The defendant appreciates and accepts the benefit.
- The defendant retains the benefit under circumstances that make it inequitable to do so without paying for its value.
- The plaintiff provided the benefit with the expectation of being compensated.
- The defendant acknowledged receipt of the benefit.
- It would be unjust or unfair for the defendant to retain the benefit without compensating the plaintiff.
The types of situations in which quasi-contracts are applied are outlined in sections 68 to 72 of the Contract Act of 1872. For example, Section 68 covers scenarios where a person incapable of making contracts receives supplies from a third party, and Section 69 addresses cases where one party makes a payment on behalf of another.
In summary, quasi-contracts are a legal tool used by courts to uphold fairness and justice when there is no formal agreement in place. They ensure that no party unfairly benefits from the goods or services of another without providing compensation.
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Common law bargain theory
In contract law, a return promise is a fundamental requirement, ensuring that each party offers something of value in exchange for a promise. This is known as consideration, which is the main element of a contract. Without consideration by both parties, a contract cannot be enforceable.
The common law bargain theory, also known as the bargain-for-exchange theory, is one of the two main theories of consideration. It defines consideration as a reciprocal exchange where both parties negotiate and agree on the terms. In other words, it involves the subjective mutual assent of the parties, where the focus is on their motives for making the promises.
The bargain theory is largely based on the intentions of the parties, rather than an analysis of the benefits or detriments of the contract. This means that the bargain theory is concerned with whether the parties subjectively view the contract as a product of an exchange or bargain. For instance, a contract in which one party feels subjectively relieved, but has not gained any legal rights, might satisfy the bargain theory.
The bargain theory has largely replaced the benefit-detriment theory in modern contract theory. However, judges often cite both theories and may use them interchangeably in their decisions. These theories usually overlap, especially in standard contracts such as a contract to buy a car, where there is an objective benefit to one party and a detriment to the other.
A contract without consideration could be enforceable if it has a substitute, such as promissory estoppel or detrimental reliance. Promissory estoppel allows for the enforcement of a promise when non-performance by the promisor would cause injustice, and there is reasonable reliance on the promise.
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The consideration doctrine
Consideration is the price one pays for another's promise and is the main element of a contract. It is a promise of something of value given by a promisor in exchange for something of value given by a promisee. For example, if a person used the money to purchase an apple, the apple is the merchant's consideration, and the money is the person's consideration. The consideration may be a promise, performance, forbearance, or property with legal value, but an economic benefit is not required. A gift or gratuitous promise cannot be a consideration as there is no bargaining involved.
The doctrine of consideration has been criticised for being a mere formality that complicates commerce and creates legal uncertainty. It has been argued that the doctrine should be replaced by estoppel as a basis for contracts. However, this change would require legislation rather than judicial development.
There are two common theories that attempt to explain consideration: the benefit-detriment theory and the bargain theory. The benefit-detriment theory implies that courts are analysing whether the parties are receiving a sufficient benefit. On the other hand, the bargain theory focuses on the subjective intentions of the parties and is now more commonly used to avoid inquiries into whether consideration is adequate.
In some jurisdictions, contracts with nominal or "peppercorn" consideration will be upheld unless deemed unconscionable. However, some courts will reject "consideration" that was not truly bargained for, examining whether it had been bargained for rather than its adequacy.
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Legal right to expect payment
A contract is an agreement between parties that creates mutual obligations that are enforceable by law. These mutual obligations are also known as promises. For example, in a unilateral contract, no promisor receives a promise as consideration, whereas in a bilateral contract, there are mutual promises between the two parties.
The basic elements required for the agreement to be a legally enforceable contract are mutual assent, expressed by a valid offer and acceptance; adequate consideration; capacity; and legality. In some states, elements of consideration can be satisfied by a valid substitute.
A promise may be enforceable to the extent that the promisee has incurred substantial costs, or conferred benefits, in reasonable reliance on the promise. If a promise is breached, the law provides remedies to the harmed party, often in the form of monetary damages, or in limited circumstances, in the form of specific performance of the promise made.
In the case of a breach of contract, it is advisable to seek legal advice. An experienced solicitor will be able to suggest the best way forward and help find a solution that is acceptable to all parties. This can also include securing compensation for losses sustained due to the breach.
To determine whether someone has a legal right to expect payment, it is necessary to examine the specific contract, the promises made, and the relevant laws and doctrines, such as the consideration doctrine and promissory estoppel. Each case is unique and requires a detailed analysis of the facts and circumstances involved.
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Frequently asked questions
A return promise contract is a bilateral contract, where there are mutual promises between the two parties involved.
A contract is a promise or a set of promises for the breach of which the law provides a remedy. A promise is typically an undertaking or a commitment to do or provide something.
A unilateral contract is one where no promisor receives a promise as consideration. In contrast, a bilateral contract involves mutual promises between the two parties.
The basis for enforcing promises is often rooted in the concept of "bargain theory". Bargained-for promises are generally enforceable, while non-reciprocal promises are not. However, other factors like reliance and unjust enrichment may also be considered.







































