Michael Otsuka

I argue that prioritarianism cannot be assessed in abstraction from an account of the measure of utility. Rather, the soundness of this view crucially depends on what counts as a greater, lesser, or equal increase in a person’s utility. In particular, prioritarianism cannot accommodate a normatively compelling measure of utility that is captured by the axioms of John von Neumann and Oskar Morgenstern’s expected utility theory. Nor can it accommodate a plausible and elegant generalization of this theory that has been offered in response to challenges to von Neumann and Morgenstern. This is, I think, a theoretically interesting and unexpected source of difficulty for prioritarianism, which I explore in this article.

The aim of this article is to refute Ronald Dworkin's claim that the provision of an equal opportunity to insure against risks is sufficient to render differences in people's circumstances that are the result of luck consistent with his theory of equality of resources. Section I addresses bad luck in the circumstances of individuals in the form of mental or physical incapacitation resulting from the vicissitudes of nature. Section II addresses bad luck which is the result of the choices of other individuals to give or bequeath.