期刊名称：Discussion Paper Series / Department of Economics, New York University
出版年度：2004
卷号：1
出版社：New York University
摘要：We focus on a class of Multiple Prior Models. Those characterized by
nonatomic countably additive priors. Preferences generating such representations
have been recently axiomatized in [17]. We argue that this is
the proper setting for comparing the notions of unambiguous event given
by Epstein and Zhang in [7] and by Ghirardato, Maccheroni and Marinacci
in [10]. The two definitions are known to be nonequivalent. Our
main result is that an event T is unambiguous in the sense of Epstein and
Zhang if and only if either (i) it is unambiguous in the sense of [10]; or
(ii) conditional on T, the decision maker is an expected utility maximizer.
We also provide an easy operational criterion for establishing whether or
not an event is unambiguous in the sense of Epstein and Zhang.
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