 There are, of course, some cases in which there is more than one sufficient cause of an event. Caesar’s death seems likely to have been overdetermined, i.e., it is probable that more than one attacker’s stroke would have been sufficient by itself for his death. But instances of mental properties are not distinct from instances of physical properties that are their realizers in the way that stabbings are distinct from each other, and systematic overdetermination of our behavior is generally regarded as implausible.