 A similar problem for contractualism is presented by Thomas Nagel, who argues that, in the present state of the world, it may be impossible to construct any set of principles which no-one can reasonably reject. Any possible principle of aid will either make unreasonable demands on the affluent (from their point of view), or pay inadequate attention to the basic needs of the destitute (from their point of view). If the notion of reasonable rejection is at least partly determined by the agent’s own perspective, then any principle will be reasonably rejected by someone. (Nagel 1991 and 1999).