Cet article a pour objet d'analyser les strategies de prix d'une firme en monopole sur son marche domestique et en duopole sur un autre marche europeen. Le produit est vendu par le biais d'un reseau de distribution exclusive dans les deux pays. La firme peut etre concurrencee sur son propre...

We shape a formal framework for distinguishing the behaviour of constructive and non-constructive polynomial time approximation algorithms for NP optimization problems. We introduce a new class, called SubNPO, that includes NPO and also some other problems used in recent works.

We draw a rough shape of a general formal framework for polynomial approximation theory which encompasses the existing one by allowing the expression of new types of results. We show how this framework incorporates all the existing approximation results and, moreover, how new types of results...

We investigate properties of correlated equilibria in competitive, pure-exchange market games. We prove that: 1) the game defined in Schmeidler (1980) always admits the no-trade issue as mixed equilibrium outcome; 2) non-pure correlated equilibria may exist in every competitive strategic market...

In a previous paper, Abouda and Chateauneuf proved that for RDEU maximizing MM with non-increasing marginal utility, positivity of the bid-ask spread can be identified with a very weak form of risk aversion SMRA. We perform here a more thorough study of SMRA, firstly in a general setting, and...

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...

Cognitive dissonance or cognitive consistency theory, as we understand it, does not presume irrational behavior although it is inconsistent with normative rationality. Previous discussions have overlooked that cognitive dissonance implied dynamic undertainty. Once this dimension of choice is...

We derive from Bernis [2000] a strategic mechanism which fully implements the set of competitive equilibria on a dynamically incomplete reinsurance market VIA Nash equilibria. The mechanism is feasible, and such that the set of coalition proof Nash equilibria coincides with that of Nash...

We study attitudes towards risk in the Rank Dependent Expected Utility (RDEU) model. This model replaces expected utility by another functional, which is characterised by two functions, a utility function on outcomes in conjunction with a probability-perception function. We use the notion of...

This paper adapts the methods of Minimax-Hedging developped in Bernis & Giraud [2000] to other models of financial markets, including discontinuous semi-martingale. The measure of the risk is defined as the value of a zero-sum game between the investor and a fictitious player, representing the...