We propose a class of multiple-prior representations of preferences under ambiguity where the belief the decision … Optimism. The model does not restrict the sign of the DM's ambiguity attitude, and we show that it provides a unified framework … through which to characterize different degrees of ambiguity aversion, as well as to represent context-dependent negative and …

of beliefs (or ambiguity), imprecision of tastes (or multi-utility), and state dependence of utility. Examples include … phenomena, as well as state-dependent multi-utility generalisations of popular ambiguity models …