The volume includes two contributions on hedge funds. One evaluates the performance of hedge funds in market environments that are conducive to active management versus environments that are not. The other provides an empirical study of the market timing skills of hedge fund managers. Additionally, we have two contributions in the area of options. One extends the real options approach to options in which the underlying assets are information items such as seismic databases (rather than tangible real assets), opening the way for a complete analysis of investments along the so-called "Virtual...