
The concept of voluntary contracts is based on the principle of freedom of contract, which allows individuals and groups to form agreements without government restrictions. While this idea underpins laissez-faire economics and free-market libertarianism, it has been a subject of debate, with critics arguing that it prioritises economics over legal and labour rights. In the US, the right to make and enforce contracts is embedded in Title 42 of the US Code, which includes the formation, performance, modification, and termination of agreements.
To be considered legally valid, contracts must meet specific criteria. For instance, all parties must possess the legal capacity to contract, and the agreement must not involve illegal activities or be formed under duress or coercion. Additionally, the terms must be understandable and not intentionally hidden, as this would constitute unfair surprise.
There are two types of implied contracts: implied-in-fact and implied-in-law. Implied-in-fact contracts are formed by the circumstances and behaviour of the parties involved, assuming they understand the terms and what actions are required. On the other hand, implied-in-law contracts are formed by circumstances, ensuring that one party is not unjustly enriched by the other's performance.
| Characteristics | Values |
|---|---|
| Voluntarism | Nozick's view: Any sharing scheme that is voluntarily agreed to (excluding stealing, fraud, etc.) is just. |
| Sufficientarianism: The consented-to division must satisfy a minimal baseline. | |
| Needs and Agreement Principle: Voluntary agreements are morally justified only if each person's basic needs are guaranteed to be met. | |
| Freedom of contract | Individuals and groups may form contracts without government restrictions. |
| Opposed to minimum-wage laws, competition laws, economic sanctions, and restrictions on price fixing or contracting with undocumented workers. | |
| U.S. Constitution guarantees the right to "make and enforce contracts" in Title 42 of the US Code. | |
| The Supreme Court has applied the liberty of contract doctrine sporadically, but generally upholds reformist legislation. | |
| English law professor Patrick Atiyah dates the "age of Freedom of Contract" from 1770 to 1870. | |
| Implied contracts | Implied-in-fact: Created by the circumstances and behavior of the parties, assuming they understand the terms. |
| Implied-in-law: Formed by circumstances, ensuring that one party is not unjustly enriched by the performance of another. | |
| Both types have the same legal force as express contracts but are harder to enforce due to lack of documentation. | |
| Validity | All parties must have the legal capacity to contract. |
| Minors generally cannot enter contracts except for contracts of necessity (e.g., food and lodging). | |
| Contracts requiring a party to break the law, or made under duress or intoxication, are invalid. | |
| Contracts must not involve unfair surprise by intentionally hiding the real meaning of terms. | |
| Voluntary agreement clauses | Parties must acknowledge they have had a full and fair opportunity to read and review the agreement and consult an attorney. |
| Parties must agree that they fully understand the agreement and voluntarily enter into it without coercion. |
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What You'll Learn

Implied contracts
An implied contract is a legally binding obligation that is inferred from the actions, conduct, or circumstances of the parties involved in an agreement. Unlike express contracts, implied contracts do not require written or spoken words to come into existence. Instead, they are formed by the circumstances and behaviour of the parties involved. For example, when a customer enters a restaurant and orders food, an implied contract is created. The restaurant owner is obligated to serve the food, and the customer is obligated to pay the listed price for it.
There are two types of implied contracts: implied-in-fact contracts and implied-in-law contracts. Implied-in-fact contracts are created by the circumstances and behaviour of the parties involved. They are formed when parties perform duties as if they have a contract in place, assuming that the parties understand the terms of the agreement and the resulting actions. For example, a teenager offers to walk a neighbour's dog and is rewarded with two movie tickets. On three subsequent occasions, the same arrangement is made, but on the last occasion, the neighbour fails to provide the movie tickets. In this case, the teenager has a reasonable claim that the neighbour created an implied-in-fact contract by regularly providing movie tickets in return for dog-walking services.
Implied-in-law contracts, also known as quasi-contracts, are not formed by intent. Instead, they are based primarily on a set of circumstances rather than the behaviour of the involved parties. These contracts are recognised by courts to prevent unjust enrichment, where one party benefits at the expense of another. For example, a doctor dining at a restaurant saves a choking customer's life and is entitled to send a bill for their services, which the customer is obligated to pay.
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Freedom of contract
The concept of freedom of contract is based on the idea that individuals are free and equal, in contrast to social structures where obligations and relationships are determined by social status. The evolution of this idea has been attributed to Henry James Sumner Maine, who proposed that social structures evolve from those based on social status to those based on contractual freedom. The period from 1770 to 1870 has been described as "the age of Freedom of Contract", with the idea declining after 1870.
While freedom of contract allows individuals to shape their own rights and responsibilities, it has also been critiqued for its potential to oppress the weak and for striking down labor rights. In the United States, the right to make and enforce contracts is embedded in Title 42 of the US Code, which includes the "making, performance, modification, and termination of contracts, and the enjoyment of all benefits, privileges, terms, and conditions of the contractual relationship". However, the enforcement of contracts is subject to certain limitations, such as public policy, good morals, and the law's concern with freedom and autonomy in contractual exchange.
The law's guiding principle could be based on hypothetical or reasonable consent, rather than actual consent. Nevertheless, actual consent is crucial when the exchange impinges on domains where individuals retain special sovereignty, such as their body and mind. Contracts are generally enforced on the assumption that parties possess the capacity for informed and voluntary choice, and fraud, duress, and various forms of pressure in bargaining represent grounds for rescission.
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Voluntarism
The law of contracts, at its core, deals with voluntary or chosen legal obligations. Contracts are formed when parties voluntarily agree to alter their legal rights and duties. This is done through offers, acceptance, and consideration. For a contract to be valid, it must meet certain conditions, such as all parties having the legal capacity to contract and the contract not being formed under duress or coercion.
In the United States, the right to make and enforce contracts is enshrined in Title 42 of the US Code. This includes the freedom to form, perform, modify, and terminate contracts. However, this freedom is not absolute and is subject to government regulations such as minimum-wage laws, competition laws, and restrictions on contracting with undocumented workers.
The concept of "freedom of contract" has evolved over time. English law professor Patrick Atiyah notes that the idea of consent in contracts was largely absent before 1770, with the period from 1770 to 1870 being the "age of Freedom of Contract". However, others like Oliver Wendell Holmes Jr. and Roscoe Pound have critiqued freedom-of-contract laws, arguing that they prioritise economics over constitutional interpretation and often result in the erosion of labour rights.
To ensure voluntary agreement in contracts, certain clauses are included. These clauses typically state that each party has had the opportunity to review the contract, consult legal counsel, and fully understands the terms of the agreement. Implied contracts, which are formed through the actions, behaviour, or circumstances of the parties, also exist. These contracts are legally enforceable but may be challenging to prove in court.
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Procedural unconscionability
Courts can refuse to enforce contracts that are found to be unconscionable due to procedural or substantive unconscionability, as they are considered too unfair or oppressive. This refusal to enforce contracts is based on the principle of voluntary agreement, which holds that individuals should have the capacity for informed and voluntary choice when entering into a contract. The law's guiding principle in this regard could be described as hypothetical or reasonable consent, where the focus is on what parties would or should consent to, rather than actual consent.
To ensure voluntary agreement, individuals are often advised in writing to consult with an attorney before executing a contract. This provides them with the opportunity to fully understand the terms of the agreement and make an informed decision. Additionally, individuals are given the right to discuss all aspects of the agreement with their attorney and are informed that they are entering into the agreement knowingly and voluntarily. These measures aim to prevent procedural unconscionability by empowering individuals to make informed and voluntary choices when forming a contract.
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Knowing and voluntary agreements
The law of contracts concerns voluntary, or chosen, legal obligations. Contracts are enforced on the assumption that parties possess the capacity necessary for informed and voluntary choice. Fraud, duress, and various forms of pressure in bargaining represent grounds for rescission. For example, if a contract requires a party to break the law, it is invalid. Contracts made under duress are also invalid and unenforceable. Duress can be in the form of force, such as holding someone at gunpoint, or the threat of force. It can also be economical, such as threatening to burn down a person's house if they don't sign a contract.
In the United States, the right to make and enforce contracts is embedded in Title 42 of the US Code. This includes "the making, performance, modification, and termination of contracts, and the enjoyment of all benefits, privileges, terms, and conditions of the contractual relationship".
In addition, implied contracts are legally enforceable and can be held up in court. They are formed by the actions, behaviour, or circumstances of the people involved, rather than by intent. There are two forms of implied contracts: implied-in-fact and implied-in-law. An implied-in-fact contract is created by the circumstances and behaviour of the parties involved. For example, if a customer enters a restaurant and orders food, an implied contract is created. The restaurant owner is obligated to serve the food, and the customer is obligated to pay the prices listed on the menu. On the other hand, an implied-in-law contract ensures that someone for whom services were provided is not unjustly enriched by the performance of another.
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Frequently asked questions
A voluntary contract is a legal obligation that is chosen by the parties involved. For a contract to be considered voluntary, it must be entered into without coercion or intimidation and all parties must have the legal capacity to contract.
The law of contracts ensures that voluntary contracts are legally enforceable. This means that the parties involved have the right to make and enforce the contract, and that the contract is not invalid due to factors such as illegal subject matter, duress, or unfair surprise.
For a voluntary contract to be considered valid, all parties must have the legal capacity to contract, there must be an offer and acceptance of the offer, mutual agreement, and consideration. Additionally, the contract must not require any party to break the law, and it must be entered into without coercion or intimidation.


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