• The idea is to test for ambiguity aversion in more-or-less familiar risky situations that are not about money, such as blind dates or election outcomes. Further, the issue of whether ambiguity aversion arises from people holding pessimistic beliefs about the actual odds facing them in ambiguous situations is explored.
• The three lab experiments employ Amazon Mechanical Turk (overall n>2000) and the analysis is pre-registered, including the data exclusion criteria.
• The 24 vignettes: Would you rather be in the risky situation or the ambiguous situation? Half of the vignettes concern potential gains (e.g., new job) and half concern potential losses (e.g., losing a job).
• The results: ambiguity aversion is typically present on average in both the gain and loss framings; ambiguity aversion is greater, however, in the gain scenarios, and the amount of aversion varies quite a bit across scenarios.
• The scenario that tracked an Ellsberg urn problem showed (easily) the highest ambiguity aversion.
• For some individuals, the aversion to ambiguity seems to derive from pessimistic feelings about how ambiguity would be resolved. (The Ellsberg-style urn vignette – which involved a casino! – is particularly likely to be affected by pessimism.) But there remains a good deal of ambiguity aversion that does not derive from pessimistic beliefs (nor from "comparative ignorance," the concern that a decision maker is up against better informed folks – such as casino owners, perhaps?).
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