Ambiguous choice problems are discussed, involving three or more outcome values, the aspects of ambiguity and ambiguity aversion are revealed which cannot be displayed in the classic two-outcome Ellsberg urn problems (Ref. 1). As a result, such problems are not always captured by models designed to accommodate them. It is discussed that these aspects include Allais-type preferences over purely subjective acts, attitudes toward different sources involving different amounts of ambiguity, and attitudes toward ambiguity at different outcome levels. In this article, three types of problems called as slightly-bent coin problem, thermometer problem and ambiguity at low versus high outcomes problem are considered in which three or more outcomes can happen. The features of standard models' predictions and performance under the circumstance of the three problems considered with three or more outcomes are examined. (82 refs.)
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