That's what this whole theory is about, how to get a lot of expected return without getting a lot of risk.

整个金融理论的中心,就是如何获得高收益,同时降低风险

耶鲁公开课 - 金融市场课程节选

As you can see, part of the reason why the dividend-earnings ratio-- especially in more recent years, since 1990-- has been declining is that corporations were trying to somewhat ease the tax burden on their shareholders by doing repurchase instead of dividend.

可以看出,股利收益比降低的部分原因,尤其是在近些年,从1990年起,有所降低的原因是,公司想通过将分红,改为股票回购的方法,多少减轻股东的税负

耶鲁公开课 - 金融市场课程节选

So, the optimal thing to do if you live in a world like this n is to get n as large possible and you can reduce the standard deviation of the portfolio very much and there's no cost in terms of expected return.

如果现实中也这样简单的话,那么你就尽量增大,这样就能让投资组合的标准差,就会大大降低,从预期收益率的角度来看,这样做的成本是零。

耶鲁公开课 - 金融市场课程节选