The market’s line estimation implicitly assumes that its parameters are constant over time. Investors, who use the beta of this line for build their portfolio, have a similar behavior whatever their investment horizon. We discuss this hypothesis in this article using the technique of wavelets...

The Beta coefficient theorized by the CAPM is estimated by the Market Line. By hypothesis, the Beta is stable over time but empirical studies on it volatility don't confirm this fact. One of them is related to with agent heterogeneity hypothesis. In this paper; we study this hypothesis by...

French abstract: Dans le présent papier, nous essayons d’étudier les actions de la bourse régionale de valeur mobilière (BRVM) tout en mettant en relief le modèle de Fama-French et les dérivés du modèle d’évaluation des actifs financiers (MEDAF). Les résultats montrent que le...