Figure 2: Fraction of cooperative agents (cooperators and reward agents) <ρ> in dependence on the cost-to-benefit ratio r for different values of γ and for the considered three types of network in the snowdrift game.
From: Impact of Social Reward on the Evolution of the Cooperation Behavior in Complex Networks
(a) Square lattice, (b) ER graph and (c) SF network. Other parameters are consistent with Fig. 1.
