When you add another asset, you do better when you have three assets, you do better than if you just had two because there's more diversification possible with three assets than with two.

当你增加一种资产，有三种资产的时候，投资组合的表现会比两种资产时更好,因为三种资产相比两种资产的情况,可选择的投资组合更多。

耶鲁公开课 - 金融市场课程节选