Quantity versus uncertainty: When winning one prize is better than winning two

We predicted that a state of uncertainty would prolong a positive mood, but that people would not anticipate this when making affective forecasts. In Study 1, participants learned that they had won one prize (certain condition), two prizes (two-gift condition), or one of two prizes (uncertain condition). People in the uncertain condition were in a positive mood longer than people in the other two conditions. In Study 2, forecaster participants...