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ch7整理ppt

Chapter Seven Revealed Preference 显示偏好 Revealed Preference Analysis Suppose we observe the demands (consumption choices) that a consumer makes for different budgets. This reveals information about the consumer’s preferences. We can use this information to ... Revealed Preference Analysis Test the behavioral hypothesis that a consumer chooses the most preferred bundle from those available. Discover the consumer’s preference relation. Assumptions on Preferences Preferences do not change while the choice data are gathered. are strictly convex. are monotonic. Together, convexity and monotonicity imply that the most preferred affordable bundle is unique. Assumptions on Preferences Direct Preference Revelation Suppose that the bundle x* is chosen when the bundle y is affordable. Then x* is directly revealed preferred to y (otherwise y would have been chosen). x*直接显示偏好于y Direct Preference Revelation Direct Preference Revelation That x is directly revealed preferred to y will be written as x y. Indirect Preference Revelation Suppose x is revealed directly preferred to y, and y is revealed directly preferred to z. Then, by transitivity, x is indirectly revealed preferred to z. Write this as x z so x y and y z x z. Indirect Preference Revelation Indirect Preference Revelation Indirect Preference Revelation Indirect Preference Revelation Indirect Preference Revelation Indirect Preference Revelation Indirect Preference Revelation Two Axioms of Revealed Preference To apply revealed preference analysis, choices must satisfy two criteria -- the Weak and the Strong Axioms of Revealed Preference. The Weak Axiom of Revealed Preference (WARP) If the bundle x is directly revealed preferred to the bundle y then it is never the case that y is directly revealed preferred to x; i.e. x y not (y x). 显示偏好的弱公理 The Weak Axiom of Revealed Pref

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