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Chapter 11. Mixed Strategy Nash Equilibrium

Chapter 11. Mixed Strategy Nash Equilibrium As we have seen, some games do not have a Nash Equilibrium in pure strategies. However, existence of Nash Equilibrium would follow if we extend this notion to Mixed strategies. All we need is for each player s Mixed Strategy to be a best response to the Mixed strategies of all other players. Example: Matching pennies game. We saw before that this game does not have a Nash Equilibrium in pure strategies. Intuitively: Given the pure conflict nature of the matching pennies game, letting my opponent know for sure which Strategy I will choose is never optimal, since this will give my opponent the ability to hurt me for sure.

profile is a mixed‐strategy Nash equilibriumif and only if playing is a best response to ? . That is: Ü Ü ? Ü Ü Ü ? Üfor each Ü Ü • Fact #1 about mixed‐strategy Nash Equilibrium:A mixed strategy is Üis a best response to ? Üonly if Üassigns positive probability exclusively to

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  Sanh, Equilibrium, Nash equilibrium

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Transcription of Chapter 11. Mixed Strategy Nash Equilibrium

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