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moon · 2022年08月03日

AS是上升了

* 问题详情,请 查看题干

NO.PZ201809170400000507

问题如下:

Monongahela Ap is an equity fund analyst. His manager asks him to evaluate three actively managed equity funds from a single sponsor, Chiyodasenko Investment Corp. Ap’s assessments of the funds based on assets under management (AUM), the three main building blocks of portfolio construction, and the funds’ approaches to portfolio management are presented in Exhibit 1. Selected data for Fund 1 is presented in Exhibit 2.

Ap learns that Chiyodasenko has initiated a new equity fund. It is similar to Fund 1 but scales up active risk by doubling all of the active weights relative to Fund 1. The new fund aims to scale active return linearly with active risk, but implementation is problematic. Because of the cost and difficulty of borrowing some securities, the new fund cannot scale up its short positions to the same extent that it can scale up its long positions.

Ap reviews quarterly holdings reports for Fund 3. In comparing the two most recent quarterly reports, he notices differences in holdings that indicate that Fund 3 executed two trades, with each trade involving pairs of stocks. Initially, Fund 3 held active positions in two automobile stocks—one was overweight by 1 percentage point (pp), and the other was underweight by 1pp. Fund 3 traded back to benchmark weights on those two stocks. In the second trade, Fund 3 selected two different stocks that were held at benchmark weights, one energy stock and one financial stock. Fund 3 overweighted the energy stock by 1pp and underweighted the financial stock by 1pp.

In Fund 3’s latest quarterly report, Ap reads that Fund 3 implemented a new formal risk control for its forecasting model that constrains the predicted return distribution so that no more than 60% of the deviations from the mean are negative.


What was the effect of Fund 3’s two trades on its active share? Fund 3’s active share:

选项:

A.

decreased.

B.

remained unchanged.

C.

increased.

解释:

B is correct. Active share changes only if the total of the absolute values of the portfolio’s active weights changes. For the two trades in Fund 3, both the initial position and the new position involved two stocks such that one was 1pp underweighted and the other was 1pp overweighted. Although the active weights of particular securities did change between the initial position and the new position, the total absolute active weights did not change.

Therefore, the portfolio’s active share did not change.

Fund 3 held active positions in two automobile stocks—one was overweight by 1 percentage point (pp), and the other was underweight by 1pp. Fund 3 traded back to benchmark weights on those two stocks. In the second trade, Fund 3 selected two different stocks that were held at benchmark weights, one energy stock and one financial stock. Fund 3 overweighted the energy stock by 1pp and underweighted the financial stock by 1pp.


(1)根据题目,trade1是把权重调回bechamark【Fund 3 traded back to benchmark weights on those two stocks. 】,那么active share=0

(2)trade 2是把权重偏离bechmark【 Fund 3 overweighted the energy stock by 1pp and underweighted the financial stock by 1pp.】,那么AS=1%

所以AS是上升了

5 个答案
已采纳答案

笛子_品职助教 · 2022年08月15日

嗨,从没放弃的小努力你好:


同学的理解是正确的。这道题确实有歧义,这道题应该改一下会比较好,把两次交易的影响,改成第2次交易的影响,就没有分歧了。也就是,把two trades on its active share改成 the second trades on its active share,就非常明确和清晰了。


如果问“这个交易对于xx有什么影响”,那肯定是问的交易完成后对xx有什么影响,而不是交易完成前对xxx有什么影响,是吗?

是的,这道题问的是交易完成后,对AS有什么影响。

没有交易,AS =1%

第一次交易后,AS=0%

第二次交易后,AS =1%

两次交易完成后,AS =1%。


所以这道题,我理解是对比“两次交易完成后” 但是答案是对比“第一次交易前,和第二次交易后,就很奇怪”

是的,两次交易完成后AS=1%,是没有歧义的了。

歧义在于,把两次交易完成后的1%,与哪个数值进行比较,是与两次交易完成前的1%比较,还是第一次交易完成后,第二次交易完成前的AS =0进行对比。可能是这题本身的歧义了,如果能把two trades on its active share改成 the second trades on its active share,会更好一些。





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笛子_品职助教 · 2022年08月13日

嗨,从没放弃的小努力你好:


老师,这个题目根本看出来是对比第一次交易前和第二次交易后 麻烦您仔细看下我问的问题,谢谢。 问题问的是two trades on its active share(默认就是两个交易完成之后),怎么能推的出来【第二次交易完成后 VS 第一次交易之前】,如果是这样,那不是问题应该问的是before firsrt trade vs after second trade?


但如何看出来问的是”在trade1交易完成前”,我看题目表示【原本一个多1%,一个少1%,trade1是把他们调回和bechmark一样】 【Fund 3 traded back to benchmark weights on those two stocks. 】


我这边的理解是,two trades on its active share,就是before firsrt trade vs after second trade

两次交易,对active share的影响,也就是比较两次交易之前(也就是第一次交易前)和两次交易后(也就是第2次交易后),这两个时间点,active share的变化。


结合同学之前的问题,比较的是,两次交易前的“原本一个多1%,一个少1%”,以及两次交易后的“依然是一个多1%,一个少1%”。这两个状态下,active share是相同的。原来AS=1%,第一次交易后AS =0,第二次交易后AS =1%,两次交易对AS没有影响。


同学也可以说说,对于two trades on its active share这句话,同学是如何理解的。比如,同学认为,根据这句话,把第一次交易后的AS =0与第二次交易后的AS=1,进行比较的理由是什么。然后我再来看看,对于two trades on its active share这句话的分歧,问题是出自哪里。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

笛子_品职助教 · 2022年08月11日

嗨,努力学习的PZer你好:


如何看出来问的是”在trade1交易完成前”,我看题目表示【原本一个多1%,一个少1%,trade1是把他们调回和bechmark一样】 【Fund 3 traded back to benchmark weights on those two stocks. 】


从问题看出来的。

What was the effect of Fund 3’s two trades on its active share?

两次交易对As的影响,也就是,比较第一次交易前的AS,和第二次交易后的AS。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

笛子_品职助教 · 2022年08月03日

嗨,从没放弃的小努力你好:


看问题。

What was the effect of Fund 3’s two trades on its active share?


两次交易对AS的影响,意思是,第二次交易完成后,以及第一次交易之前,对比这两个时点的AS。

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moon · 2022年08月11日

这个题目问的就很有歧义

笛子_品职助教 · 2022年08月03日

嗨,从没放弃的小努力你好:


(1)根据题目,trade1是把权重调回bechamark【Fund 3 traded back to benchmark weights on those two stocks. 】,那么active share=0

是的,同学理解正确。


2)trade 2是把权重偏离bechmark【 Fund 3 overweighted the energy stock by 1pp and underweighted the financial stock by 1pp.】,那么AS=1%

是的,同学理解正确。


所以AS是上升了

是的,如果把trade2,与trade1进行对比,AS确实上升了。同学理解正确。


但是本题问的并不是,trade2和trade1对比,本题问的是,trade2交易完成后,与trade1交易完成前,active share的变化。

在trade1交易完成前,active share是1%,trade1交易完成后,active share是0,trade 2交易完成后,active share是1%

trade2后与trade1前,active share不变。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!