Figure 4
From: Local reputation, local selection, and the leading eight norms
The effect of the likelihood of an AllD mutant entry and the initial proportion of AllD on cooperation. (a) As the rate at which AllD agents are introduced into the population increases, the level of cooperation decreases. Under local evolution, we see that the decrease is generally linear. Under global evolution, after the initial drop in cooperation for small β values, for 0.15 < β < 1 we see a smooth decline in cooperation as the rate of mutations increases. (b) The differential impact of the initial proportion of AllD agents on the success of social norms in maintaining universal cooperation. Group II strategies lose their dominance starting from 25% of AllD players at the outset in global evolution (left) and from 40% in local evolution (right). In contrast, groups I and III maintain their dominance even if a large majority of the population initially consist of AllD agents.
