Peter Forrest (1982) argues that modal realism leads to inductive scepticism. According to modal realism, there are other thinkers very much like us who are deceived by their surroundings. Given this, we should doubt our inductive inferences. Lewis’s reply is that modal realism does not make inductive challenges any worse than they were before. It is common ground that inductive inference is fallible. That is, it is common ground that these inferences could fail. Thinking of the possibilities of