Contract

A contract is an agreement that specifies certain legally enforceable rights and obligations pertaining to two or more parties. A contract typically involves consent to transfer of goods, services, money, or promise to transfer any of those at a future date. The activities and intentions of the parties entering into a contract may be referred to as contracting. In the event of a breach of contract, the injured party may seek judicial remedies such as damages or equitable remedies such as specific performance or rescission. A binding agreement between actors in international law is known as a treaty.

Contract law, the field of the law of obligations concerned with contracts, is based on the principle that agreements must be honoured. Like other areas of private law, contract law varies between jurisdictions. In general, contract law is exercised and governed either under common law jurisdictions, civil law jurisdictions, or mixed-law jurisdictions that combine elements of both common and civil law. Common law jurisdictions typically require contracts to include consideration in order to be valid, whereas civil and most mixed-law jurisdictions solely require a meeting of the minds between the parties.

Within the overarching category of civil law jurisdictions, there are several distinct varieties of contract law with their own distinct criteria: the German tradition is characterised by the unique doctrine of abstraction, systems based on the Napoleonic Code are characterised by their systematic distinction between different types of contracts, and Roman-Dutch law is largely based on the writings of renaissance-era Dutch jurists and case law applying general principles of Roman law prior to the Netherlands' adoption of the Napoleonic Code. The UNIDROIT Principles of International Commercial Contracts, published in 2016, aim to provide a general harmonised framework for international contracts, independent of the divergences between national laws, as well as a statement of common contractual principles for arbitrators and judges to apply where national laws are lacking. Notably, the Principles reject the doctrine of consideration, arguing that elimination of the doctrine "bring[s] about greater certainty and reduce litigation" in international trade. The Principles also rejected the abstraction principle on the grounds that it and similar doctrines are "not easily compatible with modern business perceptions and practice".

Contract law can be contrasted with tort law (also referred to in some jurisdictions as the law of delicts), the other major area of the law of obligations. While tort law generally deals with private duties and obligations that exist by operation of law, and provide remedies for civil wrongs committed between individuals not in a pre-existing legal relationship, contract law provides for the creation and enforcement of duties and obligations through a prior agreement between parties. The emergence of quasi-contracts, quasi-torts, and quasi-delicts renders the boundary between tort and contract law somewhat uncertain.

Contracts are widely used in commercial law, and for the most part form the legal foundation for transactions across the world. Common examples include contracts for the sale of services and goods, construction contracts, contracts of carriage, software licenses, employment contracts, insurance policies, sales or leases of land, among others. A contractual term is a "provision forming part of a contract". Each term gives rise to a contractual obligation, breach of which can give rise to litigation, although a contract may also state circumstances in which performance of an obligation may be excused. Not all terms are stated expressly, and terms carry different legal weight depending on how central they are to the objectives of the contract.

Contracting is a specific phase within procurement. It includes creating, negotiating, and managing contracts.

Obligations created by contracts can generally be transferred, subject to requirements imposed by law. Laws regarding the modification of contracts or the assignment of rights under a contract are broadly similar across jurisdictions. In most jurisdictions, a contract may be modified by a subsequent contract or agreement between the parties to modify the terms governing their obligations to each other. This is reflected in Article 3.1.2 of the Principles of International Commercial Contracts, which states that "a contract is concluded, modified or terminated by the mere agreement of the parties, without any further requirement". Assignments are typically subject to statutory restrictions, particularly with regard to the consent of the other party to the contract.

Contract theory is a large body of legal theory that addresses normative and conceptual questions in contract law. One of the most important questions asked in contract theory is why contracts are enforced. One prominent answer to this question focuses on the economic benefits of enforcing bargains. Another approach, associated with Charles Fried in his book Contract as Promise, maintains that the general purpose of contract law is to enforce promises. Other approaches to contract theory are found in the writings of legal realists and critical legal studies theorists, which have propounded Marxist and feminist interpretations of contract. Attempts at understanding the overarching purpose and nature of contracting as a phenomenon have been made, notably relational contract theory. Additionally, certain academic conceptions of contracts focus on questions of transaction cost and 'efficient breach' theory.