Strategii de echilibru pentru opțiuni

strategii de echilibru pentru opțiuni

Nash equilibrium

The kicker's mixed-strategy equilibrium is found câștiguri pasive pe internet folosind programe the fact that he will deviate from strategii de echilibru pentru opțiuni unless his payoffs from Left Kick and Right Kick are exactly equal. That is because the goalie is guarding that side more.

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Chiappori, Levitt, and Groseclose try to measure how important it is for the kicker to kick to his favored side, add center kicks, etc.

Their article is well-known as an example of how people in real life use mixed strategies despite not being mathematically sophisticated.

Cap. 5 Strategii Optiuni

Significance[ edit ] In his famous paper, John Forbes Nash proved that there is an equilibrium for every finite game.

One can divide Nash equilibria into two types.

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Pure strategy Nash equilibria are Nash equilibria where all players are playing pure strategies. Mixed strategy Nash equilibria are equilibria where at least one player is playing a mixed strategy.

Strategy (game theory)

While Nash proved that every finite game has a Nash equilibrium, not all have pure strategy Nash equilibria, due to the nature of game theory in not always being able to rationally describe actions strategii de echilibru pentru opțiuni players in dynamic and Bayesian games.

For an example of a game that does not have a Nash equilibrium in pure strategies, see Matching pennies.

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However, many games do have pure strategy Nash equilibria e. Further, games can have both pure strategy and mixed strategy equilibria. Interpretations of Mixed Strategies[ edit ] During the s, the concept of mixed strategies came under heavy fire for being "intuitively problematic", since they are weak Nash equilibria, and a player is indifferent about whether to follow his equilibrium strategy probability or deviate to some other probability.

The first, due to Harsanyi[6] is called purificationand supposes that the mixed strategies interpretation merely reflects our lack of knowledge of the players' information and decision-making process.

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Apparently random choices are then seen as consequences of non-specified, payoff-irrelevant exogenous factors. Each of the agents chooses a pure strategy, and the payoff depends on the fraction of agents choosing each strategy.

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The mixed strategy hence represents the distribution of pure strategies chosen by each population. However, this does not provide any justification for the case when players are individual agents.

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Later, Aumann and Brandenburger[7] re-interpreted Nash equilibrium as an equilibrium in beliefs, rather than actions. For instance, in rock paper scissors an equilibrium in beliefs would have each player believing the other was equally likely to play each strategy.

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This interpretation weakens the descriptive power of Nash equilibrium, however, since it is possible in such an equilibrium for each player to actually play a pure strategy of Rock in each play of the game, even though over time the probabilities are those of the mixed strategy. Behavior strategy[ edit ] While a mixed strategy assigns a probability distribution over pure strategies, a behavior strategy assigns at each information set a probability distribution over the set of possible actions.

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While the two concepts are very closely related in the context of normal form games, they have very different implications for extensive form games. Roughly, a mixed strategy randomly chooses a deterministic path through the game tree, while a behavior strategy can be seen as a stochastic path.

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The relationship between mixed and behavior strategies is the subject of Kuhn's theorema behavioral outlook on traditional game-theoretic hypotheses. The result establishes that in any finite extensive-form game with perfect recall, for any player and any mixed strategy, there exists a behavior strategy that, against all profiles of strategies of other playersinduces the same distribution over terminal nodes as the mixed strategy does.

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The converse is also true. A famous example of why perfect recall is required for the equivalence is given by Piccione and Rubinstein [ full citation needed ] with their Absent-Minded Driver game.

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