Abstract

Can we coherently conceive of an agent whose practical rationality is limited to merely instrumental reasoning? I argue that we cannot. Existing arguments to this effect have focused on what is required in order to have reasons to take means to our ends-or on what is required in order to be bound by the so-called ‘instrumental principle’. By contrast, I argue that consideration of the special kind of concept-use characteristic of instrumental reasoning reveals that a merely instrumentally rational agent would not be so much as able to identify means to ends in the first place. I then elucidate this line of thought by testing it against three different conceptions of merely instrumentally rational agency found in the literature. I conclude by highlighting a risk associated with remaining agnostic concerning the possibility of merely instrumentally rational agents: namely, that we arrive at a false conception of our own capacity to identify means to ends as somehow isolated from our conceptions of the good.