ABSTRACT
This chapter presents its point of departure from the Interpersonal Addition Theorem. The theorem, by John Broome, is a re-formulation of the classical result by John Harsanyi. It implies that, given some seemingly mild assumptions, the overall utility of an uncertain prospect can be seen as the sum of its individual utilities. Broome and Jensen have argued that the Priority View cannot be seen as a plausible competitor to utilitarianism: Given the addition theorem, prioritarianism should be rejected for measurement-theoretical reasons. According to the Principle of Personal Good, one prospect is better than another if it is better for everyone or at least better for some and worse for none. Broome's Interpersonal Addition Theorem is inspired by a formally similar aggregation theorem, due to Harsanyi.
