 Although contract theorists differ in their account of the reasons of individuals, with some being attracted to more objectivist accounts (Scanlon 2013), most follow Hobbes in modeling individual reasons as subjective, motivationally internal, or at least agent-relative. This may be because of skepticism about moral reasons generally (Harman 1975, Gauthier 1986, Binmore 1998), a conviction about the overwhelming importance of self-interest to the social order (Hobbes 1651, Buchanan 2000 [1975], Brennan and Buchanan 1985), a concern to take seriously the disagreement of individual view in modern society (Gaus 2011a, 2016; Muldoon 2017; Moehler 2014, 2015, 2018) or because this approach is consistent with the most well-developed theories of rational choice in the social sciences (Binmore 2005, Buchanan 2000 [1975]). In any case, the reasons individuals have for agreeing to some rules or principles are importantly their own reasons, not “good reasons” from the impartial perspective. Of course, those same individuals may care about what they perceive to be the impartial good or some other non-individualistic notion—they need not be egoists—but what they care about, and so their reasons will differ from one another. This point, as Rawls highlights in his later work, is crucial to understanding political justification in a diverse society where members of a society cannot reasonably be expected to have similar conceptions of the good (Rawls 1996). Recent contractarian accounts put even greater weight on heterogeneity (Southwood 2010, Gaus 2016, Muldoon 2017, Moehler 2018, Sugden 2018).