
A contract is a legally binding agreement between two or more parties, which can be oral or written. Contracts are formed through an exchange of promises, and the law enforces them. A promise, on the other hand, is not always legally enforceable. It is a commitment or declaration of intent to do or refrain from doing something. While a contract may consist of mutual promises, the legal implications of a breach of contract differ from those of a broken promise. This distinction between contracts and promises is essential in understanding the remedies available when one party fails to uphold their end of the agreement.
| Characteristics | Values |
|---|---|
| Nature | A contract is a promise or a set of promises for the breach of which the law gives a remedy. |
| Formation | Contracts are formed by an offer and acceptance. |
| Oral or Written | Contracts can be oral or written, but written contracts are advisable. |
| Legally Binding | Contracts are legally binding and enforceable by law. |
| Promises | Promises are an expression of intent to do something. |
| Legally Enforceable Promises | Whether a promise is legally enforceable depends on factors such as consideration and serious intent. |
| Quasi-Contractual Obligation | Quasi-contractual obligations are based on the doctrine of unjust enrichment. |
| Proprietary Estoppel | Courts may enforce promises made regarding real property, creating property rights. |
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What You'll Learn

Contracts are a voluntary legal obligation
A contract is a voluntary legal obligation that is formed when two or more parties agree to an exchange of goods or services. It is a promise or a set of promises that are legally enforceable, meaning that the law provides a remedy for any breach of contract. For example, if one party fails to deliver the promised goods or services, the other party may seek legal recourse to enforce the contract or obtain compensation.
The key element that distinguishes contracts from other types of legal obligations is voluntary consent. In contract law, individuals have the freedom to decide whether to enter into a contractual relationship. This is in contrast to tort duties, which are obligations imposed by law, regardless of the parties' desires. By entering into a contract, parties voluntarily assume the obligations and responsibilities outlined in the agreement.
The formation of a contract requires mutuality, involving an offer and acceptance, as well as consideration, which refers to the "price" paid for the goods or services obtained. Additionally, the parties involved must have the legal capacity to understand the terms of the contract and ensure its legality. Certain contracts may also be required to be in writing, particularly those governed by the statute of frauds, to prevent fraud or disputes regarding the existence of the contract.
While contracts are voluntary in nature, they carry significant legal weight. Courts play a crucial role in enforcing contracts and resolving disputes arising from breaches of contract. The interpretation and enforcement of contracts are guided by various sources of law, including common law, the Uniform Commercial Code (UCC), and relevant statutes.
In certain cases, promises made outside of a formal contract may also be legally enforceable. For instance, proprietary estoppel allows courts to enforce promises related to property rights, even if there was no explicit bargain. Similarly, promissory estoppel can be used as a defence against a breach of contract claim, protecting the expectations of the parties involved.
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Promises are not always legally enforceable
While the obligation to keep promises is a commonly acknowledged moral duty, not all promises are legally enforceable. This is because the term 'promise' in a legal context is distinct from its use in everyday conversation. In law, a promise is a contract 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.
For a promise to be legally enforceable, it must be sufficiently definite, and the legal liability of the parties involved must be easily fixed. For example, a contract may be deemed unenforceable if the time of performance, the price to be paid, the work to be done, or the property to be transferred are not clearly outlined.
Additionally, the common law "bargain theory" states that bargained-for promises are generally enforceable, while non-reciprocal promises are generally unenforceable. However, this theory does not always reflect reality, as contract law also considers principles of reliance and unjust enrichment. For instance, a promise may be enforceable if the promisee has incurred substantial costs or conferred benefits in reasonable reliance on the promise.
Courts may also enforce promises made regarding real property, known as "proprietary estoppel". This allows courts to create or effect property rights based on promises, even if there was no bargain involved. For example, if an individual promises to bequeath a property to someone in their will, and that person reasonably relies on this promise by taking or refraining from certain actions, proprietary estoppel may be invoked.
Furthermore, the legal doctrine of "promissory estoppel" can be employed in certain jurisdictions to enforce promises that do not constitute a contract. To recover under this doctrine, four requirements must be met: a promise must be made, the promise must be reasonably and foreseeably relied upon, and the reliance must be detrimental to the promisee.
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Contracts are formed through offer and acceptance
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. However, a contract is more than just a promise—it is a promise that can be enforced in a court of law.
Offer and acceptance are generally recognized as essential requirements for the formation of a contract, along with other requirements such as consideration and legal capacity. An offer is an expression of willingness to contract on certain terms, with the intention that it shall become binding as soon as it is accepted by the person to whom the offer is addressed, known as the "offeree". The offeror may revoke an offer before it has been accepted, but the revocation must be communicated to the offeree. If the offer is encapsulated in an option, such as through payment as in the case of an option contract, it cannot be revoked.
An acceptance is only contractually valid if the proposal is an offer capable of acceptance. The acceptance must be communicated and must "mirror" the offer—that is, it must be an absolute and unqualified acceptance of all the terms of the offer. If there is any variation, even on an unimportant point, there is no contract.
In the formation of a unilateral contract, acceptance may not need to be communicated and can be accepted through conduct by performing the act. However, the person performing the act must do so in reliance on the offer. A unilateral contract differs from a bilateral contract, where there is an exchange of promises between two parties.
Courts have developed rules to resolve problems that arise when an offer or acceptance is in transit between the parties, such as the "mailbox rule," which states that an acceptance is valid as soon as it is sent.
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Quasi-contractual obligations are based on unjust enrichment
A contract is a promise or a set of promises that, if breached, the law provides a remedy for. However, a promise alone may not always be legally binding. For example, a promise by a professor that you will enjoy a particular class may not be legally binding.
Quasi-contracts, also known as implied contracts, are court-created legal agreements between two parties who did not have a previous obligation to each other. They are based on the doctrine of unjust enrichment, which states that a person shall not be allowed to profit or enrich themselves inequitably at another's expense. In other words, quasi-contracts are a way to prevent one party from being unjustly enriched at the expense of another.
In the context of contract law, unjust enrichment refers to the retention of a benefit conferred by one party to another without offering compensation when compensation is reasonably expected. For example, an owner may have terminated a contract before completion and may be found to be in breach of contract. However, if the contractor would have suffered a substantial loss if they had completed the contract, strict application of the principle of contract damages may not adequately compensate the contractor for their losses. In such cases, an approach founded on equity rather than contract may be applied to prevent the defendant from being unjustly enriched at the expense of the plaintiff.
Quasi-contractual obligations are based on the principle of unjust enrichment, where the duty defines the agreement. In other words, the obligation to be bound by an exchange is implied by law rather than an explicit agreement between the parties. This is often used as a legal remedy to protect against unjust enrichment and ensure fair outcomes when one party has an advantage over another. For example, if Person A offers to pay Person B to help them move to a new apartment and agrees to pay $100 for the help, a quasi-contractual obligation may be imposed to ensure that Person B receives the agreed-upon compensation for their services.
In summary, quasi-contractual obligations are based on the principle of unjust enrichment, which seeks to prevent one party from being unjustly enriched at the expense of another when there is no explicit agreement in place. Quasi-contracts are court-imposed obligations that outline the duty of one party to compensate another when a benefit or property has been conferred or received, ensuring a fair outcome in situations of inequity.
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Proprietary estoppel can create property rights
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. Proprietary estoppel is a specific type of estoppel that concerns promises or assurances given in relation to rights or interests over property or land. It is one of four principal mechanisms to acquire rights over property, particularly in the case of land (the others being a contract, an implied trust, and adverse possession).
Proprietary estoppel can create or effect property rights despite it not being a bargain. It can arise when someone promises someone else that they will enjoy a right or benefit over a property. For example, it could be that the owner of the land promises to give you the property on their death through their will. You then reasonably rely on that representation by doing something or refraining from doing something.
The threefold pattern of proprietary estoppel (clear assurance, reasonable reliance, and substantial detriment) makes it consistent with its partner in the law of obligations, "promissory estoppel". In the case of promissory estoppel, the court may enforce promises made regarding real property. For example, in the case of Crabb v Arun District Council, a farmer acquired the right to a path over the council's land because they had assured him that if he sold off one portion, an access point would remain.
In the case of Thorner v Major, David (a second cousin) worked on Peter's farm for 30 years and believed he would inherit it. This was probably Peter's intention, but after falling out with other relatives, he destroyed his will, leaving David with nothing. The House of Lords held that David had a good proprietary estoppel claim. Lord Hoffmann remarked that if a reasonable person could understand that an assurance was given, however obliquely, a legal right would accrue.
In another case, Jennings v Rice, Mr Jennings had worked as a gardener for a Mrs Royle since the 1970s, but the administrator of her estate had no will. Mr Jennings had been told he "would be alright" and that "this will all be yours one day". The Court of Appeal resolved that not the full estate, worth £1.285m, but only £200,000 would be awarded in view of the actual detriment incurred by Mr Jennings and the uncertainty of what his assurances really meant.
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