Social contract theory

Why should anyone obey a government? For most of history the answer was tradition or divine right: kings ruled because God or custom said so. Social contract theory offers a different and more radical answer. Political authority is legitimate, it argues, only because the people have agreed to it. Strip away the ceremony and the state rests on a kind of bargain between the governed and those who govern. The three thinkers who shaped this tradition — Thomas Hobbes, John Locke and Jean-Jacques Rousseau — agreed on the method but reached strikingly different conclusions.

The state of nature

Each begins with a thought experiment: imagine human life with no government at all. This is the state of nature. It is not meant as accurate history but as a device for reasoning about what a state is for and what powers it may justly hold. By picturing life without authority, we can ask what we would rationally agree to in order to leave that condition behind. The character of each thinker’s contract follows directly from how bleak or benign they judged the state of nature to be.

Hobbes: order above all

Writing during the English Civil War, Thomas Hobbes painted the darkest picture. In Leviathan (1651) the state of nature is a “war of all against all,” where, lacking any common power to keep them in awe, people live in constant fear. His famous verdict is that life there is “solitary, poor, nasty, brutish, and short.” The rational escape is for everyone to covenant together to hand their rights to a single sovereign whose near-absolute power guarantees peace.

For Hobbes, almost any government is better than none, because the alternative is a return to chaos.

This is why Hobbes resists dividing or limiting sovereign power: a weak or contested authority invites the disputes that can tip society back into conflict. Subjects should obey except where their own survival is directly at stake.

Locke: government as a trust

John Locke was far more optimistic. In his Two Treatises of Government (1689) the state of nature is governed by a law of nature and is merely inconvenient rather than catastrophic. People already possess natural rights to life, liberty and property; they form government chiefly to protect those rights more reliably. Crucially, government is a trust with limited powers. If a ruler systematically violates the rights it was created to defend, it breaks the trust, and the people may resist or replace it. This logic — limited, accountable government and a right of resistance — deeply influenced later constitutional and revolutionary thought.

Locke also faced an obvious problem: hardly anyone has actually signed a contract. His answer was tacit consent — by living within a state and enjoying its protections, you implicitly accept its authority. Critics from David Hume onward found this unconvincing, since most people cannot realistically leave.

Rousseau: freedom through the general will

Jean-Jacques Rousseau opened The Social Contract (1762) with the line that man “is born free, and everywhere he is in chains.” His puzzle was how people could join society without losing their freedom. His answer was the general will — the collective interest of the community as a whole, distinct from the mere sum of private wants (the “will of all”). When citizens together form a sovereign body and obey laws that express the general will, they obey only rules they have helped to author, and so remain free even while obeying. This fusion of liberty and obedience is Rousseau’s distinctive and contested move.

Comparing the three

The contrast can be put simply. Hobbes wants us to escape chaos by submitting to an absolute sovereign. Locke wants limited, accountable government that protects natural rights. Rousseau wants genuine self-rule through the general will. They prioritise different values — Hobbes order, Locke individual rights, Rousseau collective freedom — and so license very different states.

Why it still matters

Social contract theory remains the vocabulary of modern legitimacy. Ideas of government by consent, popular sovereignty, limited state power and the right to hold rulers accountable all draw on it. Critics rightly note that the original contract is a fiction no one signed, that tacit consent is shaky, and that historical contracts excluded women, the poor and colonised peoples. Yet whenever we ask whether a government has a mandate, or where the limits of its authority lie, we are still speaking the language Hobbes, Locke and Rousseau invented.