We experimentally examine whether communicating private signals after each stage game affects cooperation in an infinitely repeated two-player prisoner’s dilemma where players can only observe imperfect and private signals about the partner’s actions. Based on evidence from two...

We use a novel experimental design to disentangle strategically- and non-strategically-motivated cooperation. By using contingent responses in a repeated sequential prisoners' dilemma with a known probabilistic end, we differentiate end-game behavior from continuation behavior within individuals...