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James · 2024年02月15日

记得大结论,但是不记得小细节

NO.PZ2016031001000171

问题如下:

Empirical duration is likely the best measure of the impact of yield changes on portfolio value, especially under stressed market conditions, for a portfolio consisting of:

选项:

A.

100% sovereign bonds of several AAA rated euro area issuers.

B.

100% covered bonds of several AAA rated euro area corporate issuers.

C.

25% AAA rated sovereign bonds, 25% AAA rated corporate bonds, and 50% high-yield (i.e., speculative-grade) corporate bonds, all from various euro area sovereign and corporate issuers.

解释:

C is correct. Empirical duration is the best measure—better than analytical duration—of the impact of yield changes on portfolio value, especially under stressed market conditions, for a portfolio consisting of a variety of different bonds from different issuers, such as the portfolio described in Answer C. In this portfolio, credit spread changes on the high-yield bonds may partly or fully offset yield changes on the AAA rated sovereign bonds and spread changes on
the AAA rated corporate bonds; this interaction is best captured using empirical duration. The portfolios described in Answers A and B consist of the same types of bonds from similar issuers—sovereign bonds from similar-rated sovereign issuers (A) and covered bonds from similar-rated corporate issuers (B)—so empirical and analytical durations should be roughly similar in each of these portfolios.

考点:Empirical duration

解析:对于一个由不同发行人发行的各种不同债券组成的投资组合,empirical duration为更好的度量。高收益债券的信用利差变化可能部分或全部抵消AAA级主权债券收益率的变化和信用利差的变化,故选项C正确。

老师能再解释一下在承压市场环境下,投资级债券和HY债券之间的duration是如何抵消的吗?

1 个答案

李坏_品职助教 · 2024年02月16日

嗨,努力学习的PZer你好:


这段话的意思是:在压力市场环境下,因为信用利差和基准利率是负相关的,那么信用利差因为经济不好而上升,但是基准利率却在下降。

C选项的投资组合中,AAA级债券的利率下降的影响,被 high-yield债券的利差上升给抵消了。


本来对于一个普通债券来说,收益率下降会导致久期上升。但是现在存在抵消效应,所以真实的empirical duration并没有上升那么多。



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虽然现在很辛苦,但努力过的感觉真的很好,加油!

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