Others have suggested that Rawls has entirely mistaken the very logic of desert. If justice is getting what one is due, then the basis of desert must ultimately be undeserved. However, desert is a relational concept that expresses a relationship between a deserved and a basis of desert. It simply destroys the character of desert to demand, as Rawls does, that the basis of desert be itself deserved. For example, if we say a man deserves some primary good because of some quality or action "Y", we can always ask, as Rawls does, "but does he deserve 'Y'?" and so on. We then either have an infinite regress of bases of desert or arrive at some basis, some beginning point, which the individual cannot claim to have deserved or to be responsible for, but only to have or have been given by nature. After all, no human being exists causa sui; even to reduce the basis of claims to the very narrow one of life itself reveals Rawls' difficulty: surely no one can "deserve" or "claim credit for" their own existence.