 The probabilistic approach to risk dominates in philosophy as well as in other disciplines, but some philosophers have investigated an alternative, modal account of risk. According to this account, “[t]o say that a target event is risky is to say that (keeping relevant initial conditions for that event fixed) it obtains in close possible worlds” (Pritchard 2016, 562). The risk is smaller, the more distant the nearest possible world is in which the target event takes place. This approach has interesting connections with psychological accounts of risk, but it is far from clear how distance between possible worlds should be defined and determined.