Figure 3. Selection-mutation equilibrium in the space of memory-one strategies for different costs and selection strengths.

The graphs in (a) show the linear coefficients L_i according to Eq. (12), whereas the graphs in (b,c) show the strategy abundance for intermediate (w = 0.1) and strong (w = 10) selection, respectively. In each case, the 16 curves are plotted in three different panels (depending on the strategy’s abundance), in order to increase the clarity of the Figure. WSLS is most abundant when cooperation is cheap, whereas AllD and GT become predominant as c exceeds a critical threshold. The other parameters are the same as before, N = 100 and ε = 0.01.