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Spencer · 2022年08月15日

No, he incorrect with regard to covariance between assets

NO.PZ2018091702000039

问题如下:

Owen and Yang meet with Callie Steven, an upper level executive with AutoPay, a small but fast growing privately held company. She has been employed with AutoPay for more than 15 years and as a result, her holdings in AutoPay are estimated to be more than 30% of her total portfolio. She believes that over the next several years AutoPay will put together an initial public offering, resulting in a huge windfall. She states that she has a significant portion of her portfolio in short-term bonds and money market funds to offset the risk of her AutoPay shares. Owen points out to Steven that her current portfolio is subject to mental accounting, is not constructed in layers, and does not take into consideration covariance between assets.

Is Owen’s comment regarding Steven’s current portfolio correct?

选项:

A.

No, he is incorrect with regard to portfolio construction 

B.

Yes

C.

No, he incorrect with regard to covariance between assets

解释:

A is correct.

Owen’s comment regarding Steven’s current portfolio construction is not correct. Her current portfolio is subject to mental accounting, has been constructed in layers and does not take into consideration covariance between assets.  

老师请问,C选项是不对的,那就是说covariance between asset观点是正确的,题目covariance between asset的观点是没有考虑资产间的协方差,对吧?为何加入了short term bond等资产表示没有考虑资产间的协方差呢?

1 个答案

王琛_品职助教 · 2022年08月16日

嗨,努力学习的PZer你好:


1)老师请问,C选项是不对的,那就是说covariance between asset观点是正确的,题目covariance between asset的观点是没有考虑资产间的协方差,对吧?

是的,同学的理解完全正确

这道题其实不难,只是因为题干的表述有否定表述 "is not constructed" “does not take into consideration”

选项又有否定表述 "is incorrect with",所以理解题意的时候,可能有点绕,有点像考查阅读理解了

观点就是:没有考虑到资产间的协方差,这个观点是正确的

2)为何加入了short term bond等资产表示没有考虑资产间的协方差呢?

因为关于组合中的资产「分类」及「权重」,并不是 Steven 基于均值方差分析和对资产之间协方差的考虑,所构建的多元化投资组合

题目没有交代说,Steven 按照 mean variance,通过研究得出最优化的权重, 所以达不到 Owen mean-variance 定义下的 diversification 哈

请参考:https://class.pzacademy.com/qa/61765

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