Abstract

Frank Jackson claims that consequentialists should hold the view that Derek Parfit labels the second ‘mistake in moral mathematics’, which is the view that “If some act is right or wrong because of . . . effects, the only relevant effects are the effects of this particular act.” But each of the three arguments that Jackson offers is unsound. The root of the problem is that in order to argue for the conclusion Jackson aims to establish (that consequentialists should not regard the second “mistake” as a mistake), one must presuppose an overly narrow, and hence distorted, understanding of what consequentialism is.