“…When one player's type is private information, the issue is cast as whether equilibria with low payoffs for that player can be eliminated; see, for example, Cripps and Thomas (1997) and Cripps et al (2005). More recently, there has been research allowing both players to have private information; see, for example, Atakan and Ekmekci (2008). Also relevant is work on relational contracts where, in a different setting and with a different mechanism than that modeled here, players learn to cooperate more effectively (while in our setting, they simply learn to cooperate); see Chassang (2010) and Halac (2012).…”