
Contracts are a legally binding agreement between parties that creates mutual obligations enforceable by law. While contract law is generally governed by state common law, some specific court interpretations of a particular element of the contract may vary between states. Contracts are generally classified along four dimensions: explicitness, mutuality, enforceability, and degree of completion. Some common types of contracts include executory contracts, express and implied contracts, simple contracts, and unconscionable contracts.
| Characteristics | Values |
|---|---|
| Formation | Contracts are formed when a duty arises from a promise made by one of the parties. |
| Binding Effect | Contracts are legally binding when a promise is exchanged for adequate consideration. |
| Types | - Express: agreements involving individuals explicitly and precisely stating their intentions. |
- Implied: parties indicate a contractual promise through actions, without stating their intentions directly.
- Executory: agreements consisting of a set of promises that have yet to be completed.
- Executed: agreements that have been carried out fully by both parties.
- Quasi: an obligation imposed by law to prevent unjust enrichment.
- Consensual: perfected by consent.
- Formal/solemn: essential requisites plus formality/solemnity.
- Real: essential requisites.
- Simple: not always written, but uphold principles of mutual consent, understanding, and clarity.
- Unconscionable: oppressive and unfair, often used as a defense against enforcement.
- Adhesion/form: may be beneficial due to convenience, but are scrutinized by courts due to the potential for unequal bargaining power. | | Validity | Essential requisites for a contract's validity: consent, proper subject matter, and consideration or causa. | | Enforceability | Contracts are generally enforceable by law. However, some non-contract promises are enforceable under the doctrine of promissory estoppel. |
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What You'll Learn

Consensual contracts
Another example of a consensual contract is when purchasing a product from a store. By paying for the item, the buyer agrees to the terms and conditions of the sale, including the price and return policy. If the store fails to deliver the product or provide an agreed-upon refund, the buyer can take legal action. Consensual contracts can also include agency agreements, partnership agreements, and hiring arrangements.
It is important to note that consensual contracts require all parties to have the capacity to consent and understand the terms and conditions of the contract. Contracts formed under duress, fraud, or with individuals lacking the necessary understanding may be deemed invalid and unable to be properly executed. Additionally, contracts must fall within the scope of existing law to be considered valid and enforceable.
In the context of contract law, consensual contracts play a significant role in facilitating agreements between individuals, businesses, and governments. They provide a framework for mutually beneficial relationships and shape actions and interactions across various domains. Understanding the intricacies of contract law is crucial for legal professionals to effectively advocate for their clients and maintain the integrity of contractual relationships.
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Formal/solemn contracts
Formal or solemn contracts refer to agreements that require specific legal formalities to be valid and enforceable. These formalities may include being in writing or through a public document. The requirement for a specific format is absolute and indispensable when mandated by law. Examples of such contracts include marriage contracts, donations exceeding a certain value, antichresis agreements specifying interest, and the sale of land by an agent.
The distinction between formal and consensual contracts lies in the presence of additional formalities or solemnities in the former. While consensual contracts are perfected by mere consent, formal contracts require more than mutual agreement to be valid. This distinction is particularly relevant in certain legal contexts, such as palimony cases, where the absence of a formal marriage contract impacts the financial rights and obligations of unmarried couples.
The validity of a formal contract depends on its compliance with the applicable law's specific requirements. These requirements can vary, as illustrated by the contrast between negotiable instruments, which must adhere strictly to the Negotiable Instruments Law, and valid agreements for the sale of land, where oral authority from the principal to the agent is sufficient.
The essential requisites for a valid contract, regardless of its classification, typically include consent, a proper subject matter, and consideration or causa for the obligation assumed (Article 1318, Civil Code). Once these elements are present, the contract is generally valid and obligatory, regardless of its form, be it oral or written.
In summary, formal or solemn contracts are a type of agreement that necessitates specific legal formalities to be valid and enforceable. These formalities are in addition to the essential requisites of any contract, such as consent and consideration. The specific format required by law for a formal contract varies depending on the applicable legislation and the nature of the agreement.
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Real contracts
A real contract is a legally binding agreement that involves the exchange of a physical object or property. It can be a written document or a verbal agreement, but it requires more than mere consent—it involves promises that must be kept. If these promises are not kept, there are consequences.
The term "real contract" is derived from Roman law and is used in Civil law. It refers to contracts related to both personal and real property. Real contracts include transactions in the form of commodatum, depositum, mutuum, and pignus.
The elements of a real contract are consent, object cause, and delivery. A deposit is constituted from the moment a person receives a thing belonging to another, with the obligation of safely keeping it and returning it. If the safekeeping of the thing delivered is not the principal purpose of the contract, there is no deposit but some other contract.
A pledge is a contract by which one person delivers to another a movable or instrument evidencing incorporeal rights to secure a principal obligation. When the obligation is fulfilled, the item or instrument is returned by the creditor to the debtor. Commodatum is a species of bailment, where one party binds themselves to return certain personal chattels to another party, who delivers them to be used without reward.
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Express contracts
Contracts are typically classified according to explicitness, mutuality, enforceability, and degree of completion. Express contracts are one such type of contract, and they are formed when two parties explicitly agree on a set of promises. This is in contrast to implied contracts, where the agreement is inferred from the behaviour or actions of the parties involved.
The explicitness of express contracts makes them straightforward to identify and understand. The terms of the contract are clearly communicated and accepted by both parties, leaving little room for ambiguity or misinterpretation. This clarity is particularly important when disputes arise, as it provides a solid foundation for resolving conflicts and determining the rights and obligations of each party.
In the context of express contracts, mutuality refers to the exchange of promises between the parties. Both parties must give their consent and agree to the terms, creating a mutual understanding and obligation to fulfil their respective promises. This mutuality is a fundamental aspect of contract law, ensuring that both sides are committed to upholding their end of the bargain.
Additionally, enforceability is a critical aspect of express contracts. Most express contracts are enforceable by law, meaning that if one party fails to fulfil their promise, the other party has the legal right to seek remedies or compensation. Enforceability provides a sense of security and ensures that individuals and businesses can rely on the promises made in the contract.
Finally, the degree of completion in express contracts refers to the stage at which the contract is partially or fully performed. A partially executed contract occurs when one party has fulfilled their promise, while the other has not. On the other hand, a fully executed contract is achieved when both parties have fulfilled their obligations and the contract is complete. Understanding the degree of completion helps determine the current status of the contract and the remaining obligations of the parties involved.
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Implied contracts
Contracts are typically classified according to explicitness, mutuality, enforceability, and degree of completion. Implied contracts, also known as quasi-contracts, are legally binding obligations that are assumed to exist based on the actions, conduct, or circumstances of the parties involved, rather than a written or verbal agreement. They are generally classified as either implied-in-fact or implied-in-law.
Implied-in-fact contracts are created by the circumstances and behaviour of the parties involved. For instance, if a customer orders food at a restaurant, an implied contract is created, obligating the restaurant owner to serve the food and the customer to pay for it. Similarly, an implied warranty is a type of implied-in-fact contract. When a product is purchased, it is expected to fulfil its function; otherwise, the manufacturer or seller has failed to meet the terms of the implied contract.
Implied-in-fact contracts may also be formed by past conduct. For example, if a neighbour consistently rewards a teenager with movie tickets in exchange for dog-walking services, an implied contract is created. This type of contract assumes that the parties understand the terms of the agreement and the resulting actions.
On the other hand, implied-in-law contracts, or quasi-contracts, are not formed by intent. Instead, they are imposed by law to prevent unjust enrichment, where one party benefits at the expense of another. For instance, if a lumberyard mistakenly delivers lumber to the wrong house, the recipient is expected to pay for the materials, despite the absence of a formal agreement. Implied-in-law contracts do not require normal contract rules such as mutual agreement, an offer, or acceptance. Instead, circumstances form the contract, and the receiver of services or goods is expected to provide consideration to avoid an imbalance of benefits.
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