In Jouini and Kallal (1995a), the authors characterized the absence of arbitrage opportunities for contingent claims with cash delivery in the presence of bid-ask spreads. Other authors obtained similar results for a more general de nition of the contingent claims but assuming some speci c price...

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...

When the markets are dynamically complete and without imperfections there are three equivalent approaches in order to price a given asset : the arbitrage approach through the existence of a risk-neutral density, the utility approach through a utility maximization program and the equilibrium...

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...

We consider a model in which any investment opportunity is described in terms of cash flows. We don't assume that there is a numéraire, enabling investors to transfer wealth through time; the time horizon is not supposed to be finite and the investment opportunities are not specifically related...

We study the deterministic control problem of maximizing utility from consumption of an agent who seeks to optimally allocate his wealth between consumption and investment in a financial asset subject to taxes on benefits with first-in–first-out priority rule on sales. Short sales are...

Le régime de l’assurance des catastrophes naturelles en France est actuellement en équilibre. Cependant, un évènement majeur peut le déséquilibrer et l’Etat peut être appelé en garantie. Des événements climatiques récents ont conduit à l’élaboration d’une réforme,...

As commitment is at the core of relationship programs, the latter should share similarities with prevention programs, which are key to the health sector. A field study with a dental network show that anxiety toward illness and trust toward the practitioner are key determinants to commitment to a...

Dans cet article nous établissons une formule de l’indice pour une économie où les producteurs utilisent la tarification marginale et nous montrons que, sous des hypothèses de monotonicité sur la correspondance d’excès de demande et les conditions suffisantes du second ordre de...

We examine auditor choice for listed companies in France where two (joint) auditors are required by law. The joint audit requirement creates a unique setting to study if a firm’s ownership structure affects its auditor-pair choice as well the consequences on earning quality. The results...