The idea of distributive justice presupposes a bounded world within which distributions takes place: a group of people committed to dividing, exchanging, and sharing social goods, first of all among themselves. That world, as I have already argued, is the political community, whose members distribute power to one another and avoid, if they possibly can, sharing it with anyone else. When we think about distributive justice, we think about independent cities or countries capable of arranging their own patterns of division (...) and exchange, justly or unjustly. We assume an established group and a fixed population, and so we miss the first and most important distributive question: How is that group constituted? (shrink)