Figure 3
From: Egoistic punishment outcompetes altruistic punishment in the spatial public goods game
The effect of the punishment fine [graph (a)] and the cost [graph (d)] on the evolution of strategies in the EI mechanism. Graphs (b) and (c) show the evolution of strategies on a time scale when \(r=2.0\); Graphs (e) and (f) show the evolution of strategies on a time scale when \(r=3.5\). Results accrued for \(\alpha =0.1\) in the upper layer, and for \(\beta =0.5\) in the lower layer. Initially, the three strategies are randomly uniformly distributed. Results show \(\alpha\) affects the level of cooperation and \(\beta\) adjusts the proportion of the pure cooperator and the egoistic pool punisher in the coexistence phase of the three strategies.
