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良爱洳 · 2020年09月24日

问一道题:NO.PZ2018091702000039 [ CFA III ]

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.  

没太理解 为什么不选C
1 个答案
已采纳答案

王琛_品职助教 · 2020年09月25日

分析

这道题有两种解题思路

思路 1

  • 首先可以判断出,Steven’s current portfolio is subject to mental accounting
  • 根据 mental accounting 的特点,可以得出
    • constructed in layers
    • does not take into consideration covariance between assets
  • 参考原版书 P129

思路 2

  • 题干中,关于 Steven’s current portfolio 的资产分类及权重,有两句关键词
    • her holdings in AutoPay are estimated to be more than 30% of her total portfolio
    • 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
  • 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
  • 参考原版书 P39 BPT 和 Markowitz’s portfolio theory 的对比

建议

  • 建议提问时,如果是针对具体选项,比如 “为什么不选 C”,可以附上你对这个选项的理解,即为什么你认为应该选 C,理由是什么
  • 如果有问必答中,同题问答数不多,也可以参考一下,教研是怎么回答的,同学有没有追加自己的理解等
  • 比如下面三个问答,提问和回答的都很好,可以补充增加对这道题的理解。本回答也做了主要参考

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