Political philosophers of the Enlightenment, from Hobbes and Locke, reaching down to John Rawls and his followers today, have found the roots of political order and the motive of political obligation in a social contract - an agreement, overt or implied, to be bound by principles to which all reasonable citizens can assent. Although the social contract exists in many forms, its ruling principle was announced by Hobbes with the assertion that there can be 'no obligation on any man which ariseth not from some act of his own'.1 My obligations are my own creation, binding because freely chosen. When you and I exchange promises, the resulting contract is freely undertaken, and any breach does violence not merely to the other but also to the self, since it is a repudiation of a well-grounded rational choice. If we could construe our obligation to the state on the model of a contract, therefore, we would have justified it in terms that all rational beings must accept. Contracts are the paradigms of self-chosen obligations - obligations that are not imposed, commanded or coerced but freely undertaken. When law is founded in a social contract, therefore, obedience to the law is simply the other side of free choice. Freedom and obedience are one and the same. Such a contract is addressed to the abstract and universal Homo oeconomicus who comes into the world without attachments, without, as Rawls puts it, a 'conception of the good', and with nothing save his rational self-interest to guide him. But human societies are by their nature exclusive, establishing privileges and benefits that are offered only to the insider, and which cannot be freely bestowed on all-comers without sacrificing the trust on which social harmony depends. The social contract begins from a thought-experiment, in which a group of people gather together to decide on their common future. But if they are in a position to decide on their common future, it is because they already have one: because they recognize their mutual togetherness and reciprocal dependence, which makes it incumbent upon them to settle how they might be governed under a common jurisdiction in a common territory. In short, the social contract requires a relation of membership. Theorists of the social contract write as though it presupposes only the first-person singular of free rational choice. In fact, it presupposes a first-person plural, in which the burdens of belonging have already been assumed.