This paper studies foundational issues in securities markets models with fixed costs of trading, i.e. transactions costs that are bounded regardless of the transaction size, such as fixed brokerage fees, investment taxes, operational, and processing costs or opportunity costs. We show that the...

The objective of this paper is to adopt a general equilibrium model and determine the socially efficient discount factor and discount rate when there are heterogeneous anticipations about the future of the economy as well as heterogeneous time preference rates. Among others we tackle the...

We study comparative statics of Nth-degree risk increases, as de ned by Ekern (1980), within a large class of problems that involve bidimensional payoffs and additive or multiplicative risks. We establish necessary and sufficient conditions for unambiguous impact of Nth-degree risk increases on...

We consider a complete financial market with primitive assets and derivatives on these primitive assets. Nevertheless, the derivative assets are non-redundant in the market, in the sense that the market is complete, only with their existence. In such a framework, we derive an equilibrium...

We address the problem of a social planner who, as in Weitzman (2001), gathers data on discount rates and wants to infer the socially efficient consumption discount rate. We propose an equilibrium approach and we analyse the expression and the properties of the resulting equilibrium discount...

This thesis studies portfolio choice and asset pricing with preferences which go beyond the standard expected utility and mean-Variance preferences. The first part of this thesis analyses a decision model in which the decision maker forms endogenous beliefs given his anticipation utility and his...

La tendance à transférer les risques sur les particuliers, à les sortir des bilans des établissements financiers pour les diluer, notamment sous forme de fonds de placements collectifs dans les avoirs d'une multitude d'épargnants éparpillés, est une tendance lourde de nos économies. La...

La modélisation et l'analyse des comportements individuels et collectifs vis-à-vis du risque est au coeur des problématiques de recherche de la chaire de la Fondation du Risque " Les particuliers face aux risques : analyse et réponse des marchés " créée grâce au soutien de Groupama....

We revisit the model proposed by Gollier-Müermann (2010). In GM, the set of possible anticipations is assumed to be exogeneously fixed. We rather propose a set of possible anticipations that is endogeneously fixed. This permits to consider lotteries with different supports and to revisit the...