Figure 2
Role of strategy-dependent willingness on cooperation. Fraction of cooperators as a function of T for different values of ηC (the willingness to change of cooperators) and ηD (the corresponding quantity for defectors). The remaining parameters are W = 2.5, β = 0.005, N = 103 and z = 30. The situation in which ηC = ηD = 1.0 is here used as baseline. Reducing ηD makes it easier for cooperators to wipe out defectors. Reducing ηC, on the other hand, has the opposite effect.