 While it is probable that they ate tainted food, it is by no means a certainty. This example shows that the Common Cause Principle, by itself, does not license token-level causal inferences. That is, it does not tell us that when two effects A and B occur on a particular occasion, then their common cause C also occurred on this occasion. Instead, the Common Cause Principle licenses the inference from a probabilistic correlation to the existence of a type-level common cause.