Michael Ridge

This paper contends that a Kantian universalizability constraint on theories of practical reason in conjunction with the possibility of collective rational agents entails the surprisingly strong conclusion that no fully agent‐relative theory of practical reason can be sound. The basic point is that a Kantian universalizability constraint, the thesis that all reasons for action are agent‐relative and the possibility of collective rational agents gives rise to a contradiction. This contradiction can be avoided by either rejecting Kantian universalizability, the possibility of collective rational agents, or the tenability of a fully agent‐relative theory of practical reason; we cannot have all three.

In this paper, I argue that anti-reductionist moral realism still has trouble explaining supervenience. My main target here will be Russ Shafer-Landau's attempt to explain the supervenience of the moral on the natural in terms of the constitution of moral property instantiations by natural property instantiations. First, though, I discuss a recent challenge to the very idea of using supervenience as a dialectical weapon posed by Nicholas Sturgeon. With a suitably formulated supervenience thesis in hand, I try to show how Shafer-Landau's proffered strategy to explain supervenience not only fails to explain supervenience, but that it also has a number of implausible consequences. The more general lesson is that strategies which may work well for explaining supervenience in the philosophy of mind and other areas cannot be assumed to carry over successfully to the metaethical context. We should therefore treat so-called `companions in guilt' arguments in this area of philosophy with considerable skepticism. Key Words: expressivism • moral realism • non-naturalism • reductionism • supervenience • trope.

The agent-relative/agent-neutral distintion is widely and rightly regarded as a philosophically important one. Unfortunately, the distinction is often drawn in different and mutually incompatible ways. The agent-relative/agent-neutral distinction has historically been drawn three main ways: the ‘principle-based distinction’, the ‘reason-statement-based distinction’ and the ‘perspective-based distinction’. Each of these approaches has its own distinctive vices (Sections 1-3). However, a slightly modified version of the historically influential principle-based approach seems to avoid most if not all of these vices (Section 4). The distinction so understood differs from numerous other distinctions with which it might easily be confused (Section 5). Finally, the distinction so drawn is important to normative theorizing for a variety of reasons (Section 6).