feb 3 lecture - 2/2/2012 Fighting and Assessment ESS:...

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2/2/2012 1 Fighting and Assessment • ESS: Evolutionarily Stable Strategy • Game theory for decision making – Cost of display – Cost of fight – Value of resource • Dung Fly – War of attrition • Walnut Husk Fly – Sequential Assessment ESS • A strategy is an ESS if, when adopted by most individuals of a population, it cannot be invaded by the spread of any rare alternative strategy. Components and assumptions of an ESS model • The strategy set • The payoff matrix • The assumption of equal payoffs for each strategy
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2/2/2012 2 Symmetrical Contests • Hawks vs. Doves • 2 potential outcomes – Escalation to Fighting – Amicable Agreement • What is the ESS when this is the case? Strategy Set Not actual hawks and doves….these are the names of the strategies Hawk (H) -- fight at escalated level, retreat only if injured. Dove (D) -- retreat immediately if opponent escalates, otherwise settle quickly without escalation (flip a coin). This is a conventional settlement. • V = value of winning
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feb 3 lecture - 2/2/2012 Fighting and Assessment ESS:...

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