Disappointment Aversion and Expectiles

This paper recasts Gul (1991)'s theory of disappointment aversion in a Savage framework, with general outcomes, new explicit axioms of disappointment aversion, and novel explicit representations. These permit broader applications of the theory and better understanding of its decision-theoretic foundations. Our results exploit an unexpected connection of Gul's theory and the econometric framework of Newey and Powell (1987) of asymmetric least square estimation.