Islamic and conventional investment funds have the same purpose. However, unlike conventional funds, Islamic funds offer different investment contracts and have to invest in accordance with a set of selection rules. This dissertation focuses on developing theoretical and empirical analysis...

The thesis explores the impact of heterogeneous beliefs on the equilibrium characteristics prevailing in economies made of irrational agents. In the first part, an economy providing investment opportunities in production of unrestricted supply and a bond of zero supply to both an optimist and a...

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...

In this thesis, we propose to test a new behavioral explanation of the equity premium puzzle. This work is based on the heterogeneous beliefs model of Jouini and Napp (2007) according to which, pessimism of investors at the aggregate level leads to very important risk premiums. In this model,...

Consumption is not only utilitarian but symbolical indeed cultural, this dissertation explains in depth what French young women from Maghreb feels in their ethnic consumer experiences. This research highlights and defines the concept of intercultural inhibition arising at these young women and...

This thesis deals with different problems related to markets with transaction costs and is composed of four parts.In part I, we begin with the study of assymptotic hedging a European option in a local volatility model with bid-ask spread.In part II, we study the optimal consumption problem in a...

Marketing has been given a strong interface and connection role within the literature, creating the assumption of a naturally “open” marketing. However, specifically, the opening of the marketing organization is not so obvious. In a theoretical paper, Day (2011) introduces the Open Marketing...

After generics, which are copies of chemical medicines, "copies" of already patented biologics (biosimilars) are entering the biologics market and competing with their originators. Many uncertainties remain regarding the development of this newly emerging market, and the ability of biosimilars...

This dissertation focuses on the managerial practices of the Lebanese SMEs leaders. It pursues the overall goal of understanding how, in a crisis marked by rapid change and various uncertainties, these leaders manage to survive and strengthen the resilience of their businesses. From here comes...

Marketing has been criticized for its lack of accountability, which is qualified by a misalignment with strategic objectives. Most of the researches propose that marketing accountability must be reinforced with more performance measures. In this doctoral thesis, we employ a different approach in...