The Constitution of Constitutivism

Why be moral? According to constitutivism, there are features constitutive of agency, actual or ideal, the properties of which explain why moral norms are normative for us. I aim to investigate whether this idea is plausible. I start off critically. After defining constitutivism and outlining its attractions and problems (chapter 1), I discuss the theories of various features of agency that are supposed to ground morality according to the leading constitutivists in the literature. I find these theories wanting. They are based on implausible assumptions about agency (chapter 2), and they fail to make sense of moral (and other) norms because the so-called shmagency objection, according to which we can shirk from our normative commitments by being ‘shmagents’ rather than agents, appears in new ways for them (chapter 3). Then I get more constructive. I defend a two-tiered form of constitutivism. The first tier captures practical rationality, and the second tier captures reasons for action. Starting with the first tier, I defend a Humean theory of agency (chapter 4) and add a principle of instrumental rationality to it (chapter 5). Appendices A and B supplement these chapters with replies to criticisms of the Humean picture. In chapters 6 and 7, I put this conception of agency to work to reach the second tier of the view. I start by defending a form of reasons internalism which treats practical reasons as grounded in the desires of ideal agents (chapter 6). Then I extend this theory to moral reasons, arguing – unexpectedly for a Humean – that we have universally prescriptive reasons to cooperate with other cooperative agents to satisfy our other respective desires (chapter 7). Hence, the constitutive features of ideal agency ground a morality of cooperation. I conclude by summarizing the case for constitutivism (chapter 8).