Notes page 125: The CML is useful for computing the expected return for an efficient portfolio however it cannot compute the expected return for an in efficient Portfolio o individual securities. The CAPM must be used to compute the expected return for any inefficient Portfolio or individual security 意思是 CAPM必须用于计算非有效的资产组合或单个资产,但是CAPM公式里用的贝塔是系统性风险,没考虑非系统风险啊。怎么理解?