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statistique, théorie et gestion de portefeuille - Docs at ISFA

statistique, théorie et gestion de portefeuille - Docs at ISFA

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474 14. Gestion <strong>de</strong> Portefeuilles multimoments <strong>et</strong> équilibre <strong>de</strong> marché<br />

μ<br />

Cn 1/n<br />

Figure 5: The dark and grey thick curves represent two efficient frontiers for a portfolio without risk-free<br />

interest r<strong>at</strong>e obtained with two measures of risks. The dark and grey thin straight lines represent the efficient<br />

frontiers in the presence of a risk-free ass<strong>et</strong>, whose value is given by the intercept of the straight lines with<br />

the ordin<strong>at</strong>e axis. This illustr<strong>at</strong>es the existence of an inversion of the <strong>de</strong>pen<strong>de</strong>nce of the slope of the efficient<br />

frontier with risk-free ass<strong>et</strong> as a function of the or<strong>de</strong>r n of the measures of risks, which can occur only when<br />

the efficient frontiers without risk-free ass<strong>et</strong> cross each other.<br />

50

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