
Implied-in-law contracts, also known as quasi-contracts, are imposed by law to prevent unjust enrichment of one party at the expense of another. They are legally binding contracts that neither party intended to create. Implied-in-law contracts are formed when one party receives a benefit from another, and it would be unfair for the recipient to retain this benefit without compensating the provider, even though no formal agreement existed between them.
| Characteristics | Values |
|---|---|
| Type of Contract | Implied-in-law contract, also known as a quasi-contract or constructive contract |
| Formation | Formed by a court to uphold justice and/or correct unjust enrichment |
| Legally Binding | Yes |
| Intent | No intent to create a contract |
| Mutual Agreement | No mutual agreement |
| Requirements | No requirements for a meeting of the minds or mutual assent |
| Purpose | To prevent unjust enrichment of one party at the expense of another |
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What You'll Learn

Implied-in-law vs. implied-in-fact
An implied contract is a legally binding obligation that arises from the actions, conduct, or circumstances of the parties involved, rather than from an explicit oral or written agreement. There are two types of implied contracts: implied-in-fact contracts and implied-in-law contracts.
An implied-in-fact contract is formed when the parties involved act as if they have a contractual agreement in place, even if no such agreement has been expressly established. This type of contract is inferred from the circumstances and behaviour of the parties, indicating their mutual intent to be bound by an agreement. For example, if a customer orders food in a restaurant, an implied-in-fact contract is created, obligating the restaurant to serve the food and the customer to pay for it.
Implied-in-fact contracts require a "meeting of the minds," where the parties understand the terms of the agreement and the actions to be taken, even if these terms are not explicitly stated. This type of contract must consist of an offer, acceptance, consideration, and mutual intent, with the terms being inferred from the parties' behaviour and conduct.
On the other hand, an implied-in-law contract, also known as a quasi-contract, is imposed by a court to uphold justice and correct unjust enrichment. This type of contract is not formed by the intent of the parties but by the court's intervention to ensure fairness. Implied-in-law contracts do not require mutual assent or a "meeting of the minds." Instead, they focus on equity and ensuring that one party is not unjustly enriched at the expense of another.
For example, if a doctor provides emergency medical treatment to an unconscious person, an implied-in-law contract is created, obligating the patient to compensate the doctor, even though no prior agreement existed. In this case, the law imposes a legal obligation on the enriched party (the patient) to compensate the other party (the doctor) to prevent unjust enrichment.
Understanding the distinction between implied-in-law and implied-in-fact contracts is crucial for business owners and contractors to manage risks, avoid disputes, and protect themselves from unjust claims.
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Quasi-contracts
Implied-in-law contracts, also known as quasi-contracts, are legally binding contracts that are created without the intention of either party. They are typically imposed by a court of law to ensure fairness and justice in situations where there is no formal agreement in place. Quasi-contracts are not traditional contracts but are instead a legal obligation for one party to compensate the other. They are constructed by a judge and are legally enforceable, meaning neither party has to agree to them.
The essential elements of a quasi-contract are a benefit conferred upon the defendant by the plaintiff, an appreciation by the defendant of such benefit, and the acceptance and retention of the benefit by the defendant under circumstances that make it unfair for them to retain it without payment. Quasi-contracts are not created when there is already an agreement or contract in place, as there would be no need for one.
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Unjust enrichment
To recover on a claim of unjust enrichment, the plaintiff must show that the defendant was enriched at their expense and that it would be unfair for the defendant to keep the benefit without providing compensation. For example, a painter may paint someone's house, conferring a benefit on the defendant in the form of a new paint job. The work was performed at the painter's expense, as they spent money on materials and time painting. The plaintiff could argue that the defendant's house is now freshly painted, yet the plaintiff bore the costs and effort.
Implied-in-law contracts, also known as quasi-contracts, are a type of implied contract. They are legally binding contracts that neither party intended to create. These contracts are imposed by the court to uphold justice and correct unjust enrichment. For example, if someone receives emergency medical treatment, they are generally required to compensate the provider, even if they did not agree to the treatment beforehand. Implied-in-law contracts focus on equity and justice, rather than requiring a meeting of the minds or mutual assent.
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Legally enforceable
An implied-in-law contract, also known as a quasi-contract or a constructive contract, is a legally binding agreement that neither party intended to create. It is imposed by law to uphold justice or to prevent unjust enrichment. This type of contract is formed when one party receives a benefit from another, and it would be unfair for the recipient to retain this benefit without compensating the provider, even though no formal agreement existed between them.
Implied-in-law contracts are not created by the explicit agreement of the parties involved but rather by the need to uphold justice and prevent unjust enrichment. They are legally enforceable and can be upheld in court, although proving the existence of an implied contract can be challenging compared to express contracts formed orally or in writing. Courts will review the relationship between the parties, previous agreements, and duties performed to determine the existence of an implied contract.
An example of an implied-in-law contract is when a customer enters a restaurant, orders food, and consumes it. The restaurant owner is obligated to serve the food, and the customer is obligated to pay the listed price, even without a formal written agreement. Another example is when a doctor provides emergency treatment to an unconscious person. The patient is generally required to compensate the doctor, even though they did not agree to the treatment beforehand.
Implied-in-law contracts differ from implied-in-fact contracts, which are formed by the circumstances and behaviour of the parties involved. In implied-in-fact contracts, the parties act as if they intend to be in an agreement, even without a formal contract. For instance, if a company continues to do business with a client under an expired contract, their conduct implies a contractual relationship.
It is important to note that implied-in-law contracts are not considered "true contracts" as they lack mutual agreement. They are governed by equitable relief rather than contract law. Additionally, a court cannot find an implied-in-law contract if there already exists an express or implied contract covering the same subject matter.
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Mutual agreement
Implied-in-law contracts, also known as quasi-contracts, are imposed by law to prevent unjust enrichment of one party at the expense of another. These are not true contracts, as they lack mutual agreement. An implied-in-law contract is established when one party receives a benefit from another, and it would be unfair for the recipient to retain this benefit without compensating the provider, even though no formal agreement existed between them.
Implied-in-law contracts are not formed by intent. This type of contract ensures that someone for whom services were provided is not unjustly enriched by the performance of another. For example, if one person benefits from another person without legal entitlement, this is called unjust enrichment. The law will require the enriched party to make restitution to the other party even if no oral or written contract to that effect exists.
Implied-in-law contracts are fundamentally different from implied-in-fact contracts in how they are created and enforced. This distinction is critical because only implied-in-fact contracts require a "meeting of the minds," while implied-in-law contracts focus on equity and justice.
Implied-in-fact contracts are made when parties perform duties as if they have a contract in place. In other words, the parties act in such a way that indicates they intend to be in an agreement with one another, even if an oral or written agreement has not been established. For example, if a company was doing business with a client under a contract that expired, but they continued to act as if the contract was in effect, this is considered an implied-in-fact contract.
Both express and implied contracts are legally enforceable promises of mutual assent to be bound. However, proving that there is or was a contract could be challenging compared to those formed orally or in writing.
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Frequently asked questions
An implied-in-law contract is a legal agreement where both parties are obligated to act justly given the circumstances, even if there is no contract in writing. It is also known as a quasi-contract or a constructive contract.
An implied-in-law contract is formed when one party receives a benefit from another, and it would be unfair for the recipient to retain this benefit without compensating the provider, even though no formal agreement existed between them.
An implied-in-fact contract is formed when parties act in a way that indicates they intend to be in an agreement with one another, even if an oral or written agreement has not been established. On the other hand, an implied-in-law contract is formed by the court to uphold justice and/or correct unjust enrichment.
Some examples of implied-in-law contracts include emergency medical services, where an unconscious person receives emergency treatment and is required to compensate the provider, and overpayment situations, where a person accidentally pays more than they owe and the law requires the recipient to return the excess payment.


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