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The intuitive criterion in game theory is a technique for equilibrium refinement in signaling games. It aims to reduce possible outcome scenarios by first restricting the type group to types of agents with could obtain higher utility levels by deviating to off-the-equilibrium messages and second by considering in this sub-set of types the types for which the off-the-equilibrium message is not equilibrium dominated.〔The Intuitive and Divinity Criterion: Interpretation and Step-by-Step Examples Felix Munoz-Garcia, Ana Espinola-Arredondo, Journal of Industrial Organization Education. Volume 5, Issue 1, Pages 1–20, ISSN (Online) 1935-5041, DOI: 10.2202/1935-5041.1024, March 2011〕 In economics, signaling games are games in which a player with private information moves first. Private information generally refers to the player's hidden or unobservable type. Signaling games typically have many perfect Bayesian equilibria. Equilibrium refinement techniques are ways of reducing the set of equilibria. Most refinement techniques are broadly based on restricting beliefs off the equilibrium path. Off equilibrium actions or outcomes are those that are different from what is predicted in a Nash equilibrium. The intuitive criterion was presented by In-Koo Cho and David M. Kreps in a 1987 article.〔"Cho, I-K. & Kreps, D. M. (1987) Signaling games and stable equilibria. Quarterly Journal of Economics 102:179-221." 〕 Their idea was to try to reduce the set of equilibria by requiring off-equilibrium beliefs to be reasonable in some sense. This refinement of the solution concept allows the modeller to choose among multiple perfect Bayesian equilibria. Formally, we can eliminate a particular perfect Bayesian equilibrium by using the intuitive criterion if there is some type θ who has a deviation that is assured of yielding him a payoff above his equilibrium payoff as long as other players do not assign a positive probability to the deviation having been made by any type θ for whom this action is equilibrium dominated. Intuitively, we can eliminate a PBE if there is a type of player who wants to deviate even though he is not sure what the beliefs of other players are. The player is only sure that the other players will not think that he is a player who would find the deviation to be an equilibrium-dominated action. An equilibrium strategy (m *, a *) violates the intuitive criterion if there is a type θ and an action he can take ''m'' such that: min ui (m,a,θ) > ui * (θ) for some θ ∈ Θ * *(m) a ∈ A *(Θ * *(m),m) Where m * is the equilibrium message, a * is the equilibrium response (action) of the receiver.〔The Intuitive and Divinity Criterion: Interpretation and Step-by-Step Examples Felix Munoz-Garcia, Ana Espinola-Arredondo, Journal of Industrial Organization Education. Volume 5, Issue 1, Pages 1–20, ISSN (Online) 1935-5041, DOI: 10.2202/1935-5041.1024, March 2011〕 ==Criticisms== Other game theorists have criticized the intuitive criterion and suggested alternative refinements such as Universal Divinity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Intuitive criterion」の詳細全文を読む スポンサード リンク
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