PSYCH 3F03 Lecture Notes - Lecture 3: Evolutionarily Stable Strategy, Inclusive Fitness, Maximum Capacity

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Pop quiz: what is positive frequency dependence. An evolutionary stable strategy, if the strategy is already adopted in the population than a rare mutant cannot invade. Direct fitness (your own reproductive success and your own offspring success) + indirect fitness (the fitness of your action that is given to others) Switch to 2nd condition since e(a,a)= e(b,a: how does a do against b and b do against b, so, e(a,b)> e(b,b, therefore, yes, a is an ess, when b plays against itself it does worse, a beats. Is a frequency dependent and if so what kind of frequency dependence does it show. Since a"s frequency is the same regardless of who the individual is playing. B is not an ess, since e(b,b)< e(a,b) It is negatively frequency dependent because when b plays itself it does worse than when it plays individuals of a different strategy cost: r(-2)-1>0 this is spite, because both the actor and the recipient are at a.

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