The relative cumulative frequency of agents’ characteristics by prejudice level. Characteristics concern number of agents (no of agents); instances of the dominant cooperative social comparison heuristic si = ui = 1 and di = 0 ((1,1,0) freq.); instances of the defection social comparison heuristic si = ui = di = 0 ((0,0,0) freq.); instances of cooperation (coop). All simulations assume five sub-populations (i.e., 5 traits). (a) Pi = 0.9 and Si = 0.8; (b) Pi = 0.9 and Si = 0.1, fixed for all agents over 50,000 generations. The circles represent the relative proportions of agents with those characteristics across ten randomly seeded runs. Starting configurations involve all agents having zero prejudice (∀i, αi = 0).