Ambiguity-aversion and Non-additive Beliefs in Non-Cooperative Games: Experimental Evidence

In subjective expected utility (SEU), people choose among acts which have different consequences, depending on which of several uncertain states occurs. Choices between acts therefore reveal implicit beliefs about the likelihood of the states, or "subjective probabilities" (Ramsey, 1931; Savage, 1954). In the SEU framework, the (implicit) likelihoods of different states certainly affects choices, but the ambiguity surrounding that likelihood--the confidence a person has in her judgment of likelihood, or the amount of information on which it is based--should not affect her choices.