Signal Detection Theory as a normative benchmark. The first experiment confirms the existence of an optimality-accuracy trade …

, i.e., groups are less risk-averse than individuals. Our study complements past research in two ways. First, we study the … group shift effect under two sources of uncertainty, namely risk where probabilities are known, and ambiguity where … group shift effect, however, is found to be significant only under risk in the unanimity treatment. Our study hence provides …