Ambiguity, ambiguity aversion and stores of value: The case of Argentina

Ambiguity and Ambiguity Aversion

Consider the following choice problem, known as “Ellsberg’s three-color urn example”, or simply the “Ellsberg Paradox” (Ellsberg [7]). An urn contains 30 red balls, and 60 green and blue balls, in unspecified proportions; subjects are asked to compare (i) a bet on a red draw vs. a bet on a green draw, and (ii) a bet on a red or blue draw vs. a bet on a green or blue draw. If the subject wins a ...

Decreasing aversion under ambiguity

Under which condition does the set of desirable uncertain prospects expand when wealth increases? We show that the decreasing concavity (DC) of the utility function  is necessary and sufficient in the −maxmin expected utility model. In the smooth ambiguity aversion model with the ambiguity valuation function , the DC of  and of ◦ is necessary and sufficient. An alternative definition of d...

Measuring Ambiguity Aversion

Loss Set A Set A Set A Set A Investment Set B Set B Set B Set B Insurance Set B Set B Set B Set B Furthermore, the subjects face four different types of information in both decision frames and treatments. The ‘precise’ information frame has exact probabilities and exact payments stated. In the ‘ambiguity in probability’ frames, the probability is stated as a range and the payment is fixed. Conv...

Triangular approximations of fuzzy number with value and ambiguity functions

Hypothesis Testing and Ambiguity Aversion∗

We study a model of non-Bayesian updating, based on the Hypothesis Testing model of Ortoleva (2012), for ambiguity averse agents. Agents ranks acts following the MaxMin Expected Utility model of Gilboa and Schmeidler (1989) and when they receive new information they update their set of priors as follows: If the information is such that all priors in the original set of priors assign to it a pro...