 If democratic societies allow members to participate as equals in collective decision making, a natural question arises: who has the right to participate in making collective decisions? We can ask this question within a particular jurisdiction (ought all adults have the right to participation? Ought children have the right to participation? Ought all residents have such rights?). But we can also ask what the extent of the jurisdiction ought to be. How many of the people in the world ought to be included in the collective decision-making? An easy, though slightly misleading, way of asking this question is, what ought the physical boundaries of a particular institution of collective decision-making be? We see partially democratic societies within the confines of the modern nation-state. But we might ask, why should we restrict the set of persons who participate in making decisions of the modern state just to those who happen to be the physical inhabitants of those states? Surely there are many other persons affected by decisions made by democratic states aside from those persons. For example, activities in one society A can pollute another society B. Why shouldn’t the members of B have a say in the decisions regarding the polluting activities in A? And there can be many other effects that activities in A can have on B.