Cooperative market norms can be stable equilibria even amid free-rider incentives

Evidence

Sugden developed a model of exchange that demonstrates how, under certain conditions, a market norm that normally results in cooperation can be a stable, though not unique, equilibrium-even when there appear to be incentives for individuals to be free riders and transactors occasionally make mistakes (breach unintentionally). The game is an adaptation of the classic prisoner’s dilemma model in which the following conditions hold: the benefit to player 1 of player 2 refraining from defecting b must be greater than the cost to player I of refraining from defecting himself c; the same must also be true for player 2; k , the probability that a subsequent round will be played, must be greater than b/c, since, if this condition did not hold, the expected gain from defection will be greater than any gain from alternative strategies. — Lisa Bernestein, Opting out of the Legal System, 190

Categorization

• DEFINE: Explains the formal conditions (b > c, k > b/c) under which a tit-for-tat cooperative norm persists despite incentives to defect.
• XREF: This formalizes the repeated-game/third-party-enforcement mechanisms that the reader is contrasting with Coleman’s network closure analysis of the Sicilian silent community. — connects to: Frequent repeated interaction makes cooperative trade equilibria feasible, whereas infrequent trade does not.; Cooperative equilibria are no likelier than noncooperative ones without belief restrictions — Diego Gambetta, Trust - Making and Breaking Cooperative…, 2804; Cooperation can occur without trust when incentives align (+11 more)
• corroborated: 2 independent passages support this claim — Lisa Bernestein, Opting out of the Legal System, 190

Broader Connections

• Mutual trust in iterated exchange is selffulfilling through aligned incentives #corroborates (0.90)
• Mafia norms function as a self-perpetuating Nash equilibrium #exemplifies (0.88)
• Cooperation can occur without trust when incentives align #corroborates (0.85)
• Untrustworthy actors free-ride on the generalized trust of honest markets #complicates (0.85)
• Frequent repeated interaction makes cooperative trade equilibria feasible, whereas infrequent trade does not. #expands (0.82)
• Cooperative equilibria are no likelier than noncooperative ones without belief restrictions #qualifies (0.78) — Diego Gambetta, Trust - Making and Breaking Cooperative…, 2804