Abstract

This chapter sets out an intertemporal addition theorem, the exact analog, across the dimension of time, of the interpersonal addition theorem. A premise of the new theorem is the 'principle of temporal good', the exact analog of the principle of personal good. It turns out that the principle of temporal good would, if true, give crucial support to the utilitarian principle. The chapter explains that the principle of temporal good is dubious, and describes how this principle might nevertheless be defended. The defence is metaphysical. It is founded on a disuniting metaphysics of personhood. A complete argument was made out by deducing the principle of temporal good from a disuniting metaphysics. The chapter shows that the principle of temporal good, if true, lends very strong support to the utilitarian principle of distribution. So a chain of argument would have been completed, linking the disuniting metaphysics to the utilitarian principle.