Reid's Regress

Thomas Reid's Essays on the Active Powers presents what is probably the most thoroughly developed version of agent-causal libertarianism in the modern canon. While commentators today often acknowledge Reid's contribution, they typically focus on what appears to be a serious problem for the view: Reid appears to commit himself to a position according to which acting freely would require an agent to engage in an infinite number of exertions of active power. In this essay, we maintain that, properly understood, Reid's version of agent-causal libertarianism generates no regress of exertion. Our discussion begins by presenting Reid's account of free action and why it appears vulnerable to a worrisome regress. We then consider three attempts to address the regress in the contemporary literature offered by William Rowe, Gideon Yaffe, and James Van Cleve, which we find unsatisfactory. We then develop a solution to the worry—one that takes very seriously both what Reid means by an ‘efficient’ cause and his appeal to normative features when explaining action. We call it the ‘networked capacity’ view.