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risk management _ shortcoming of beta based performance measurement

请问老师或者其他同学,在原版书 Volume 6: P 175, 中间段: Criticism of Risk - Adjusted Performance Appraisal Method, it says: If assets are are valued according to some other equilibrium pricing model, then beta-based performance measurement may give inaccurate appraisals. 请问这句话什么意思? 另外, beta based 与 标准差 based measurement 各自有什么优缺点? 多谢

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