What we did--the core theoretical framework that we had-- was the mean variance theory, which led us to the capital asset pricing model.

我们讲到了投资组合多元化的核心理论框架,即均值-方差模型,之后又讲到了资本资产定价模型

耶鲁公开课 - 金融市场课程节选

That's the theory of efficient portfolio calculation.

这就是最优投资组合理论。

耶鲁公开课 - 金融市场课程节选