The mutual fund theory that we gave last time said, no the mutual fund is just supposed to be diversifying for you.

但上节课讲到的共同基金定理认为,共同基金的目的是分散投资

耶鲁公开课 - 金融市场课程节选

The mutual fund industry is supposedly, and according to theory, doing this for you.

共同基金产业据称，理应为人们完成如上的这些计算。

耶鲁公开课 - 金融市场课程节选