 For example, it is quite common to follow David Lewis and define causation in terms of counterfactuals (Lewis, 1973). Assume event \(c\) causes event \(e\), then we have a situation in which both \(c\) and \(e\) occur, and in which the counterfactual statement “If \(c\) had not occurred, then \(e\) would not have occurred” is true. Thus, in Lewis’s view, \(e\) is causally dependent on \(c\) if, and only if, \(e\) is counterfactually dependent on \(c\). According to the traditional theory, formulated by Lewis and Stalnaker, any counterfactual statement is true if the consequent is true in the closest possible world to the actual world in which the antecedent is true. Apparently, Lewis’ definition delivers a non-temporal causal asymmetry, since the effect \(e\) is counterfactually dependent on the cause \(c\).