The average
gain of each time step as a
function of time. NaΓ―ve (dots): no
agent uses a strategy; Selfish (diamonds):
every agent uses his of her best strategy; Conservative (crosses): agents are reluctant to change strategies at the beginning by
giving = 30 points more to one strategy; partially altruistic (circles): 3.5%
of agents ignore their best strategies and make constant choices (, , ).