Cet article expose la problématique de la volatilité des prix des matières premières, montre quels sont les moyens pour s’en protéger et explique comment les employer. Les instruments de couverture sont présentés en première section, en distinguant le type de besoin auquel ils...

We compare the optimal trading strategy of an informed speculator when he can trade ahead of incoming news (is "fast"), versus when he cannot (is "slow"). We find that speed matters: the fast speculator's trades account for a larger fraction of trading volume, and are more correlated with...

French Abstract: Quelles sont les conséquences en matière de bien-être d'une meilleure diffusion de l'information financière parmi les spéculateurs? Pour traiter cette question, nous considérons un marché où des agents non informés échangent pour un motif de partage de risque avec des...

The food crisis of 2007-2008 and the resulting urban riots observed in about forty developing countries placed the question of price instability at the very heart of the debate. The paper states that, since the 80s, the prevailing idea is that the best option is to manage risks without...

Using Consensus Forecasts monthly surveys, we show that experts' interest rate expectations in the Eurofranc market do not verify the rational expectations hypothesis. Instead, these expectations are found to be generated by a mixed process combining the traditional adaptive, regressive and...

This survey appears in extension of a previous exploratory survey (Bouraoui, 2008) dedicated to the impact of stock spams on volumes. The interest of the present research is to study the impact on stock prices while taking into account the evolution of volatility over time through a GARCH (1,1)...

Developing a model with a switching mechanism, we show how complex dynamics can be generated even though heterogeneity arises among agents with the same trading rules (fundamentalists). We assume that there are two experts which are imitated by other operators. We show that (i) market...

We study information revelation in markets with pairwise meetings. We focus on the one sided case and perform a dynamic analysis of a constant entry flow model. The same question has been studied in an identical framework in Serrano and Yosha (1993) but they limit their analysis to the...

We introduce a tractable class of non-affine price processes with multifrequency stochastic volatility and jumps. The specifi cations require few fixed parameters and deliver fast option pricing. One key ingredient is a tight link between jumps and volatility regimes, as asset pricing theory...

In this paper, we study the following models : Heath-Jarrow-Morton (1992) and Libor-Market- Model, also known as Brace-Gatarek-Musiela model (1997). We survey the extensions of these models and their representation in the Black and Scholes world. Our approach is pedagogical and is based on an...