When the repeated prisoner's dilemma setup is generalized to allow for a unilateral breakup, maximal efficiency in equilibrium remains an open question. With restrictions of simple symmetry with eternal mutual cooperation, defection, or (matched) alternation on the equilibrium path, we describe...

Yang et al. (2007) show that assortative matching mechanisms can induce a high level of cooperation to prevail in repeated prisoners’ dilemma experiments, but societies may also head to an all-defection state rapidly. Here, we additionally provide information on income distribution and show...