Figure 2. The average offer level p, acceptance level q, and the average payoff w of the population in a typical evolutionary process for different α.

The left plot α = −5 and the middle plot α = 0, and the right plot α = 5. The population is structured by the scale-free networks. The degree-based role assignment regime is invoked to determine whoever acts as the proposer. Other parameter: m = 3, m₀ = 3, the population size N = 1000, selection intensity β = 10, δ = 0.005.