Abstract

David Lewis has argued that we can gain helpful insight to the Prisoners' Dilemmas that we face from the fact that Newcomb's Problems are easy to solve, and the fact that Prisoners' Dilemmas are nothing other than two Newcomb Problems side by side. The present paper shows that the Prisoners' Dilemmas that we face are significantly different from Newcomb Problems in that the former are iterated while the latter are not. Thus Lewis's hope that we can get insight into the former from the latter is illusory