Exact conditions for evolutionary stability in indirect reciprocity under noise
Fig 3
Payoff differences between residents and mutants for L3 and L6 norms.
We analyze the robustness of the leading norms L3 and L6 by setting each as the resident norm and considering all 15 possible mutant deviations in the action rule. For each case, we compute the expected payoff of the resident and compare it to the average payoff of the mutants, plotting the difference. We do this for two cooperation cost scenarios: low (0.2) and high (0.6). In both scenarios, deviations from L6 result in larger payoff differences than deviations from L3, suggesting that it is more costly to deviate from L6 than from L3. Parameters: b = 1, and .