What Is Social Contract Theory: Hobbes, Locke, and Rousseau Compared

The Central Question of Social Contract Theory

Social contract theory is a family of political philosophies that attempt to explain the origin and legitimacy of political authority by imagining an agreement between individuals who choose to form a society. The core question is: why would free individuals consent to be governed, and under what conditions is that government legitimate?

The theory does not claim that any literal contract was ever signed. Rather, it is a thought experiment designed to clarify the moral foundations of political obligation. If we can imagine what rational people would agree to before entering society, we can use that to judge whether existing governments are justified.

Thomas Hobbes: Leviathan and Absolute Sovereignty

Thomas Hobbes (1588–1679) painted the bleakest picture of human nature among the three major social contract theorists. In Leviathan (1651), he described the natural condition of humanity, the state of nature, as a war of all against all. Life without government, Hobbes argued, would be "solitary, poor, nasty, brutish, and short."

Because people are fundamentally self-interested and roughly equal in ability, each person is a permanent threat to every other. To escape this misery, rational individuals agree to surrender their natural freedoms to a single sovereign power, the Leviathan, in exchange for security. Crucially, Hobbes argued that this contract is irrevocable: once established, the sovereign cannot be legitimately overthrown, since any government is better than the chaos of the state of nature.

John Locke: Natural Rights and Limited Government

John Locke (1632–1704) agreed that people enter society via a social contract but drew very different conclusions. In his Two Treatises of Government (1689), Locke argued that the state of nature is not a war but rather a condition governed by natural law, in which people already possess natural rights to life, liberty, and property.

Individuals form governments not to escape chaos but to better protect rights that already exist. Government's legitimacy therefore depends on its fulfilling this purpose. If a government violates natural rights, citizens retain the right to revolt and establish a new one. Locke's ideas directly influenced the American Declaration of Independence and the liberal democratic tradition of limited government, separation of powers, and individual rights.

Jean-Jacques Rousseau: The General Will and Popular Sovereignty

Jean-Jacques Rousseau (1712–1778) introduced a third vision in The Social Contract (1762). His famous opening line, "Man is born free, and everywhere he is in chains," signals his view that existing political institutions corrupt natural human goodness rather than protect it.

Rousseau's social contract is based not on surrendering rights to a sovereign (Hobbes) or protecting pre-existing rights (Locke) but on each person committing to the general will, the collective interest of the community as a whole. In a legitimate society, individuals remain free because they obey only laws they have collectively made for themselves. Rousseau's theory is more communal and egalitarian than Locke's, and it influenced both democratic republicanism and more radical revolutionary politics.

Key Differences at a Glance

• State of nature: Hobbes (violent war) vs. Locke (peaceful but insecure) vs. Rousseau (innocent and good).
• Human nature: Hobbes (selfish and competitive) vs. Locke (rational rights-bearers) vs. Rousseau (naturally good, corrupted by society).
• Government's role: Hobbes (impose order) vs. Locke (protect natural rights) vs. Rousseau (express the general will).
• Right to revolt: Hobbes (none) vs. Locke (yes, when rights are violated) vs. Rousseau (yes, when general will is subverted).
• Political legacy: Hobbes (absolutism, realism) vs. Locke (liberalism, constitutionalism) vs. Rousseau (republicanism, democratic theory).

Later Developments: Rawls and the Modern Contract

John Rawls revived social contract theory in the 20th century with his A Theory of Justice (1971). Rawls proposed a thought experiment called the veil of ignorance: imagine choosing the principles of your society without knowing your place in it, your class, race, gender, or abilities. What would you rationally choose?

Rawls argued that behind this veil, rational people would choose a society with equal basic liberties and an arrangement of inequalities that benefits the least advantaged members. This generates his famous difference principle and provides a Kantian-inflected social contract argument for liberal egalitarianism. Rawls's framework remains one of the most influential theories in contemporary political philosophy.

Criticisms and Ongoing Relevance

Social contract theory has faced persistent objections. Communitarians like Michael Sandel argue that the atomistic individual imagined by contract theorists is a fiction; humans are constituted by communities and traditions, not prior to them. Feminist critics like Carole Pateman argue that the classical contracts implicitly excluded women, making their universalist claims hollow. Critics also note that no actual consent was ever given and that future generations cannot be bound by agreements made before their birth.

Despite these challenges, the social contract framework remains indispensable. It provides a vocabulary for asking when political authority is legitimate, when revolution is justified, and what governments owe their citizens, questions as urgent today as in the 17th century.