 Other arguments question the coherence of the idea of intrinsically fair collective decision making processes. For instance, social choice theory questions the idea that there can be a fair decision making function that transforms a set of individual preferences into a rational collective preference. The core objection is that no general rule satisfying reasonable constraints can be devised that can transform any set of individual preferences into a rational social preference. And this is taken to show that democratic procedures cannot be intrinsically fair (Riker 1982: 116). Ronald Dworkin argues that the idea of equality, which is for him at the root of social justice, cannot be given a coherent and plausible interpretation when it comes to the distribution of political power among members of the society. The relation of politicians to citizens inevitably gives rise to inequality; the process of democratic deliberation inevitably gives those with superior argument making abilities and greater willingness to participate more influence and therefore more power, than others, so equality of political power cannot be intrinsically fair or just (Dworkin 2000). In later work, Dworkin has pulled back from this originally thoroughgoing instrumentalism (Dworkin 1996).