In this paper, a fully choice-based theory of disappointment is developed. It encompasses, as particular cases, EU theory, Gul's theory of disappointment (1991) and the models of Loomes and Sugden (1986). According to the new theory, the risk premium of a random prospect is the sum of two...

[eng] Does market volatility increase ? . The French stock exchange has known a deep fall in prices for 3 years with great uncertainties on economic activity and firms' finances. So, this article deals with the size of market' s turbulences, their origins and the measures to take. A proper...