Kimball [1990] developps a theory of prudence isomorphic to Pratt [1964] and Arrow [1965] theory of risk aversion. Nevertheless, if the Arrow-Pratt risk aversion index determines behavior in risk, it is not always the case for prudence. Moreover, concept of prudence and precautionary behavior...

Dans cet article, nous examinons dans quelle mesure l'integration verticale, qu'elle se traduise par la forclusion des concurrents aval ou par la participation au marche intermediaire, emerge comme strategie d'equilibre d'un monopole amont menace par un concurrent etranger. Pour des couts de...

The general purpose of this paper is to prove quasiequilibrium existence theorems for production economies with general consumption sets in an infinite dimensional commodity space, without assuming any monotonicity of preferences or free-disposal in production.

Information Technologies (IT) induce many innovations in service industries. Innovations in IT highlight the peculiarities of innovation in service industries compared to manufactured-goods industries. Because innovations often affect competitiveness, service-providers attach a high importance...

In this paper, we define and study a new class of optimal stochastic control problems which is closely related to the theory of Backward SDE's and forward-backward SDE's. The controlled process takes values in RXR and a given initial data for X(O). Then, the control problem is to find the...

In natural language processing, electronic dictionaries are used for lexical parsing. Its transform a raw text in a sequence of tagged words ; these tags are morphological and grammatical information. Unknown words make problem. Proper nouns are a part of them. The french Prolex project consists...

Nous etudions les consequences de l'indexation de l'assurance chomage sur le dernier salaire recu dans un modele de negociations salariales. Nous montrons que la hausse de l'allocation d'assurance chomage peut diminuer le taux de chomage si les travailleurs sont suffisammnet averses au risque....

We analyze the approximation behaviour of some of the best-known polynomial time approximation algorithms for bin-packing under an approximation criterion, called differential ratio. This measure has originally been introduced by Ausiello, D'Atri and Protasi and more recently revisited, in a...