Contract

Contract law
Formation
Capacity Offer and acceptance Meeting of the minds2 Abstraction principle4,5 Posting rule1 Mirror image rule Invitation to treat Firm offer Consideration1,4 Implication-in-fact Collateral contract
Defences
Misrepresentation Mistake Threats and unequal bargaining power Illegality and public policy Unconscionability Culpa in contrahendo2 Force majeure Frustration of purpose Impossibility Impracticability Hardship Set-off Illusory promise1 Statute of frauds1 Non est factum1 Unclean hands1 Accord and satisfaction1 Exculpatory clause
Interpretation
Parol evidence3 Contract of adhesion Integration clause Contra proferentem UNIDROIT Principles
Dispute resolution
Choice of law clause Forum selection clause Hague Choice of Court Convention Arbitration New York Convention UNCITRAL Model Law Mediation Singapore Mediation Convention Enforcement of foreign judgments Hague Judgments Convention
Rights of third parties
Privity of contract1 Assignment Delegation Novation Third-party beneficiary
Breach of contract
Anticipatory repudiation Cover Exclusion clause Efficient breach Deviation Fundamental breach
Remedies
Specific performance3 Money damages Liquidated, stipulated, or penal damages3 Rescission
Quasi-contractual obligations
Promissory estoppel1 Quantum meruit1 Unjust enrichment Restitution Negotiorum gestio2
Duties of parties
Duty of honest contractual performance (or doctrine of abuse of rights)6 Duty of good faith (also implied covenant of good faith and fair dealing or duty to negotiate in good faith)7 Contract A and Contract B in Canadian contract law6
Related areas of law
Conflict of laws Commercial law
By jurisdiction
Australia Canada China (mainland) Ireland India Saudi Arabia United Kingdom England and Wales Scotland United States
Other law areas
Tort law Property law Wills, trusts, and estates Criminal law Evidence
Notes
1 Specific to common law jurisdictions 2 Specific to civil and mixed law jurisdictions 3 Historically restricted in common law jurisdictions but generally accepted elsewhere; availability varies between contemporary common law jurisdictions 4 Specific to the German Bürgerliches Gesetzbuch and other civil codes based on the pandectist tradition 5 Explicitly rejected by the UNIDROIT Principles of International Commercial Contracts 6 Specific to Canadian contract law both in Québec and in the country's common law provinces 7 Specific to civil law jurisdictions, the American Uniform Commercial Code, and Canadian jurisprudence in both Québec and the common law provinces pertaining to contractual and pre-contractual negotiation
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A contract is an agreement that specifies certain legally enforceable rights and obligations pertaining to two or more parties. A contract typically involves consent^[1] 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.^[2] A binding agreement between actors in international law is known as a treaty.^[3]

Contract law, the field of the law of obligations concerned with contracts, is based on the principle that agreements must be honoured.^[4] 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.^[5] 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".^[5]

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.^[6]