Various papers have presented folk theorem results for repeated games with private monitoring that rely on belief-free equilibria. I show that these equilibria are not robust against small perturbations in the behavior of potential opponents. Specifically, I show that essentially none of the...

We study environments in which agents are randomly matched to play a Prisoner's Dilemma, and each player observes a few of the partner's past actions against previous opponents. We depart from the existing related literature by allowing a small fraction of the population to be commitment types....

This study uses k-means clustering to analyze the strategic choices made by participants playing the infinitely repeated prisoner’s dilemma in laboratory experiments. We identify five distinct strategies that closely resemble well-known pure strategies: always defecting, suspicious...