In this paper, we study the optimal portfolio selection problem of weakly informed traders in the sense of Baudoin \cite{Baudoin_2002}. Instead of considering only expected utility maximizers, we also take into consideration different preference paradigms. In particular, we analyze a...

Why do investors keep different opinions even though they learn from their own failures and successes? Why do investors keep different opinions even though they observe each other and learn from their relative failures and successes? We analyze beliefs dynamics when beliefs result from a very...

In this paper, we show that behavioral features can be obtained at a group level when the individuals of the group are heterogeneous enough. More precisely, starting from a standard model of Pareto optimal allocations, with expected utility maximizers and exponential dis- counting, but allowing...

We test the hypothesis that "genuine" or "convincing" smiling is a costly signal that has evolved to induce cooperation in situations requiring mutual trust. Potential trustees in a trust game made video clips for viewing by potential trusters before the latter decided whether to send them...

It is shown that it is possible to construct a disequilibrium microeconomics in which agents react to the evidence of disequilibrium (inventories, nonnormal ratio of capacity utilization, etc.). In a one good model, we describe the set of fixed points In addition to normal equilibrium, two...

Can the process of change be deliberate, planned and controlled in an organisation? Does the management of change within an organisation consist in fighting the forces of resistance and stability? Not necessarily. Change creates unforeseen confrontation between the organisation and its actors....

Are management tools instrumental of socialisation and of behavioural control or can they be vectors of change? Based on four examples of the change process in companies, the author reflects on the nature and the role of management tools, considered as sources, supports or even consequences of...

The purpose of this article is to analyse the developmental process of co-operative inter-organizational relationships that entails transactions between French firms and Moroccan subcontractors. The examined industries are : chemical, textile, agrobusiness, mechanic engineering, metallurgical...