If we think the answer is No, then we might think that equality of welfare as such is not really an ideal (cf. Temkin 1993). Losses to the better off are justified only where this benefits the worse off. What we had thought of as pressure in favor of equality of welfare was instead pressure in favor of levelling up. We might say that additions to welfare matter more the worse off the person is whose welfare is affected. This view has come to be called prioritarianism (Parfit 1997; Arneson 1999b). It has tremendous intuitive appeal.