Keynes (1921) and Ellsberg (1961) have articulated an aversion toward betting on an urn containing balls of two colors of unknown proportion to one with a 50-50 composition. Keynes views this as reflecting different preferences for bets arising from different sources of uncertainty. Ellsberg...

Two distinct interpretations of ambiguity attitudes have been proposed, namely, weighting the multiple priors pessimistically and exhibiting preference over different sources of uncertainty. This study examines the links among attitudes towards three sources of uncertainty including ambiguity...

Building on the Herstein-Milnor mixture set axiomatization of expected utility theory, we employ multiple mixture operators each modeling a source of uncertainty to arrive at a definition of rich mixture sets. This enables a weakening of the reduction of compound lottery axiom leading to an...