Les actifs financiers sûrs sont au cœur de la finance de marché aujourd'hui. L'aptitude de tels actifs à protéger la valeur de l'épargne et des avoirs financiers, à servir de garantie à des prêteurs, à permettre aux entités souveraines de se financer ou encore aux banques centrales de...

The purpose of this paper is to study the effect of operational, and market risks disclosures on investors’ disagreements about French firms’ value. The paper provides evidence on risks reporting efficiency in reducing investors’ disagreements about the implication for firm’s value of...

Selon les travaux de Hamada (1972), Ryan (1997) et Pae (2002), l’incertitude des investisseurs sur la valeur est liée aux sources de risques sectoriels et inhérents. Depuis, peu de travaux se sont intéressées à la relation entre les informations liées aux sources de risques et le marché...

This chapter summarizes several empirical studies in finance, undertaken through the prism of the graph theory. In these studies, we built graphs in order to investigate integration and systemic risk in derivative markets. Several classes of underlying assets (i.e. energy products, metals,...

The global minimum variance portfolio computed using the sample covariance matrix is known to be negatively affected by parameter uncertainty, an important component of model risk. Using a robust approach, we introduce a portfolio rule for investors who wish to invest in the global minimum...

This work shows how long-term investors can benefit from adding volatility as an asset class to their portfolio. Two types of "structural" exposure – long implied volatility and long volatility risk premium – are now simple to implement. Implied volatility exposure can be used to...

We consider a life-cycle model with bequest motives, and assume that the individual does not know his/hersurvival probability and has maxmin utility preferences; we show that it is optimal not to annuitize but to purchase pure life insurance policies instead.