葛同学2019-03-25 05:50:18

Following Grinold’s fundamental law of active management, one should find: A A small number of investment bets increases the expected investment performance. B To maximize the information ratio, active investors need to either have high- quality predictions. C To maximize the information ratio, he shouldn’t place a large number of investment bets in a given year. D Investors should focus on increasing only their predictive ability relative to stock price movements. 选项a和c，都是少预测，为什么a对，c不对？ b选项，说neet高质量的预测，为什么不对？