 Finally, we note that some recent philosophers have questioned the presumed difference between event- and agent-causation by arguing that all causation is object or substance causation. They argue that the dominant tendency to understand ‘garden variety’ causal transactions in the world as relations between events is an unfortunate legacy of David Hume’s rejection of substance and causation as basic metaphysical categories. On the competing metaphysical picture of the world, the event or state of an object’s having some property such as mass is its having a causal power, which in suitable circumstances it exercises to bring about a characteristic effect. Applied to human agents in an account of free will, the account suggests a picture on which an agent’s having desires, beliefs, and intentions are rational powers to will particular courses of action, and where the agent’s willing is not determined in any one direction, she wills freely. An advantage for the agent-causalist who embraces this broader metaphysics is ‘ideological’ parsimony. For different developments and defenses of this approach, see Lowe (2008), Swinburne (2013), and O’Connor (2021); and for reason to doubt that a substance-causal metaphysics helps to allay skepticism concerning free will, see Clarke and Reed (2015).