A contract is an agreement between parties that creates legally enforceable obligations. In its simplest form: I promise to do X, you promise to do Y, and the law holds us both to our promises. The legal requirements vary by jurisdiction — offer, acceptance, consideration (something of value exchanged), capacity, and legality — but the core structure is the same: voluntary agreement backed by legal enforcement.
Contract is the legal form of market exchange. Every purchase, employment relationship, lease, and business partnership is mediated by contract. This makes contract law the infrastructure of capitalism: without enforceable agreements, complex economic coordination falls apart. The freedom to contract — to enter voluntary agreements on terms of one’s choosing — is one of the central values of liberal legal systems.
But the freedom of contract is formal, not substantive. A worker who signs an employment agreement “voluntarily” does so under conditions of economic necessity — refusing means no income. A tenant who agrees to exploitative lease terms does so because the alternative is homelessness. The contract records the agreement; it doesn’t record the power differential that shaped it. This is the Marxist critique: contract law treats formally equal parties as substantively equal, obscuring the structural inequalities that determine who gets to set terms and who has to accept them.
The social contract tradition (Hobbes, Locke, Rousseau) extends the contract metaphor to political authority itself: legitimate government rests on an agreement, explicit or implied, between the governed and the governing. Citizens obey the law in exchange for protection and order. This metaphor has been enormously influential, but it obscures as much as it reveals — no one actually signed the social contract, and those most subject to state power (indigenous peoples, enslaved people, colonial subjects) were never party to any agreement.
Related terms
- Rights — the claims that contracts create and that contract law enforces
- Adjudication — the process that resolves contract disputes
- Property — the legal relation that contracts transfer
- Legitimacy — the political quality that social contract theory claims to explain