 Social contract theories fundamentally differ in whether the parties reason differently or the same. As we have seen (§2.3) in Rawls’s Original Position, everyone reasons the same: the collective choice problem is reduced to the choice of one individual. Any one person’s decision is a proxy for everyone else. In social contracts of this sort, the description of the parties (their motivation, the conditions under which they choose) does all the work: once we have fully specified the reasoning of one party, the contract has been identified.