OBSERVABILITY AND OPTIMALITY

被引:24
作者
GEANAKOPLOS, JD [1 ]
POLEMARCHAKIS, HM [1 ]
机构
[1] COLUMBIA UNIV,NEW YORK,NY 10027
基金
美国国家科学基金会;
关键词
D O I
10.1016/0304-4068(90)90040-G
中图分类号
F [经济];
学科分类号
02 ;
摘要
Observability of an individual's excess demand function for assets and commodities as all prices and revenue vary suffices in order to recover his von Neumann-Morgenstern utility function. This is generically the case, even when the asset market is incomplete and the cardinal utility indices state dependent, as long as there are at least two commodities traded in spot markets at each state of nature. On the contrary, if the response of individual's excess demand for assets as prices in spot commodity markets vary is not observable, recoverability fails when the asset market is incomplete. In particular, it is not possible to contradict the claim that the competitive allocation is fully optimal in spite of the incompleteness of the asset market. This provides a characterization of the efficacy of intervention in an economy with an incomplete asset market based on the information available to a planner from the observable behavior of individuals. © 1990.
引用
收藏
页码:153 / 165
页数:13
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