Abstract

Necessary-condition analyses of singular causal claims are particularly vulnerable to cases of linked overdetermination, so named because the nonoperation of the back-up factor (in fail-safe cases) or the preempted factor (in preemptive cases) is linked to the operation of the actual cause. As an example J. L. Mackie's analysis is here challenged with a simple switch-light case. Three replies are considered, a facts-vs.-events reply, a different-effect reply, and an in-the-circumstances reply. All are found deficient.