 Social contract theories differ about the object of the contract. In the traditional contract theories of Hobbes and Locke, the contract was about the terms of political association. In particular, the problem was the grounds and limits of citizen’s obligation to obey the state. In his early formulation, Rawls’s parties deliberated about “common practices” (1958). In his later statement of his view, Rawls took the object of agreement to be principles of justice to regulate “the basic structure:”