 For Rawls, as for most contemporary contract theorists, the object of agreement is not, at least directly, the grounds of political obligation, but the principles of justice that regulate the basic institutions of society. Freeman (2007a: 23), focuses on “the social role of norms in public life.” Buchanan is concerned with justifying constitutional orders of social and political institutions (2000 [1975]). Gauthier (1986), Scanlon (1998), Darwall (2006), Southwood (2010), and Gaus (2011a) employ the contract device to justify social moral norms or rules.