The Significance of the Dualism of Practical Reason

Utilitas 15 (03):315- (2003)
Sidgwick argued that utilitarianism and egoism were in conflict, that neither theory was better justified than the other, and concluded that there was a and all that remained to him was . The dualism argument introduced by Sidgwick is an extremely powerful sceptical argument that no theory of ethics is rationally required: it cannot be shown that a moral sceptic or an egoist ought to accept the moral theory, otherwise she is unreasonable. I explain two ways in which the significance of the dualism argument has been underestimated. First, I suggest that a hybrid theory such as utilitarianism with an egoist bias is not (as is sometimes thought) a solution to the dualism. Second, I argue that the dualism argument is not restricted to a conflict between hedonic egoism and utilitarianism, but applies to any attempt to show that a theory of ethics is rationally required
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DOI 10.1017/S0953820800004088
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Brian McElwee (2007). Consequentialism, Demandingness and the Monism of Practical Reason. Proceedings of the Aristotelian Society 107 (1pt3):359-374.

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