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

There's one other possibility here I've missed which is what if Pepsi prices at marginal cost itself?

这里还缺少一个可能性,即,如果百事定价在边际成本怎么办

耶鲁公开课 - 博弈论课程节选