理论上，此举有助于银行降低风险，券商可从中获益，投资者也能选择一些符合其风险偏好的债务组合。

In theory, this helps the Banks to reduce risk, makes money for intermediaries who trade the securities, and allows the investors to pick tranches of debt that match their risk appetite.

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一些经济学家还对现代投资组合理论的适用性表示怀疑。

Some economists also express doubts as to the applicability of Modern Portfolio Theories. Consider this comment by a thought leader in MPT, William sharpe.

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利用随机微分方程理论，对一类具有随机特征的风险投资组合问题进行深入研究。

With the theory of stochastic differential equation, the authors discuss a problem of a class of risk investment portfolio with stochastic character.

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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

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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