  We design and implement lab experiments to evaluate the normative appeal of
behavior arising from models of ambiguity-averse preferences. We report two
main empirical findings. First, we demonstrate that behavior reflects an
incomplete understanding of the problem, providing evidence that subjects do
not act on the basis of preferences alone. Second, additional clarification of
the decision making environment pushes subjects' choices in the direction of
ambiguity aversion models, regardless of whether or not the choices are also
consistent with subjective expected utility, supporting the position that
subjects find such behavior normatively appealing.
