Many theories have been developed to model decision behavior under ambiguity. In this paper we empirically investigate theories which are based on non-additive probabilities, i.e. Choquet expected utility (CEU) theories. We first replicated Ellsberg-paradox behavior. Then we elicited the...

In subjective expected utility (SEU) the decision weights people attach to events are their beliefs about the likelihood of events. Much empirical evidence, inspired by Ellsberg (1961) and others, shows that people prefer to bet on events they know more about, even when their beliefs are held...