Trotz jahrzehntelanger Forschung zur Gültigkeit der Hypothese informationseffizienter Kapitalmärkte (EMH) sind wesentliche damit verbundene Fragestellungen noch immer ungeklärt. Eine ist diejenige nach der Existenz und der Erklärung von zeitvariablen Überrenditen ("Time Varying Excess...

Across numerous asset classes, momentum strategies have historically generated high Sharpe ratios and strong positive alphas relative to standard asset pricing models. However, the returns to momentum strategies are negatively skewed: they experience infrequent but strong and persistent strings...

Using a simple sign test, we report new empirical evidence, taken from both the US and the German stock markets, showing that trading behavior substantially changed around Black Monday in 1987. It turned out that before Black Monday investors behaved more as in the momentum strategy; and after...