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The figure shows the proportion of ... -strategists ( ... ) in a population of individuals who, at each time step, are randomly matched in pairs to play a symmetric 2×2 game. The two possible actions (or pure strategies) in the game are labeled ... and ... . Thus, each individual in the population is either an ... -strategist or a ... -strategist. The payoffs of the game are ... , ... , ... , and ... (parameters), where, for instance, ... denotes the payoff obtained by an ... -strategist when he plays with a ... -strategist. At the end of each time step, after all individuals have played the game, one randomly selected player revises her strategy— ... or ... —according to the following rule: "I look at another (randomly selected) individual; if and only if she got a payoff higher than mine, I adopt her strategy". The initial proportion of ... -strategists in the population is the parameter ... .
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