Abstract

Invariabilism is the view that the same theory of welfare is true of every welfare subject. Variabilism is the view that invariabilism is false. In light of how many welfare subjects there are and how greatly they differ in their natures and capacities, it is natural to suppose that variabilism is true. I argue that these considerations do not support variabilism and, indeed, that we should accept invariabilism. This has important implications: it eliminates many of the going theories of welfare while making some of the remaining ones more attractive.