Marc Johansen

Causation is extrinsic. What an event causes depends not just on its own nature and the laws, but on the environment in which it occurs. Had an event occurred under different conditions, it may have had different effects. Yet we often want to say that causation, in at least some respect, is not extrinsic. Events exert an influence on the world themselves, independently of what other events do or do not occur in their surroundings. This paper develops an account of such influence and argues that it provides a solution to the causal exclusion problem. By locating that solution largely within the metaphysics of causation, we can solve the exclusion problem without taking on a commitment to a theory of mind

Regularity theories of causation are guided by the idea that causes are collectively sufficient for their effects. Following Mackie [1974], that idea is typically refined to distinguish collections that include redundant members from those that do not. Causes must be collectively sufficient for their effects without redundancy. While Mackie was surely right that the regularity theory must distinguish collections that are in some sense minimally sufficient for an effect from those that include unnecessary hangers-on, I believe that redundancy is the wrong mark of that distinction. I propose a way to develop the regularity theory without it. Instead of distinguishing minimal from mere sufficiency in terms of redundancy, we should look to the influence that events have in the world. Causes, so construed, must have just enough collective influence to ensure that an effect occurs. I argue that such an account provides a uniform solution to the problem of epiphenomena and to a pair of related problems that aris..