While recently the after-cost profits of many anomalies are close to zero, investing according to the Mean-Variance (MV) criterion has never been so rewarding. The Global Minimum Variance Portfolio is the simplest option to profitably gain exposure to the market by timing stock covariances....

The main purpose of this study is to empirically examine the relationship between uncertainty and idiosyncratic volatility of Nikkei 225 stocks. We conclude that there is a positive relationship between economic policy uncertainty and idiosyncratic volatility. Employing additional uncertainty...