Well, it can only be true if security selection and market timing detract from institutional returns or individual returns in the aggregate.

唯一的可能性就是证券选择,和市场时机选择,给机构和个人带来的是负的回报

耶鲁公开课 - 金融市场课程节选

The Morningstar study is incredibly damning in terms of the market timing abilities of individual investors.

晨星公司这一研究结果,谴责了个体投资者的市场时机选择能力

耶鲁公开课 - 金融市场课程节选