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西红柿面 · 2024年06月27日

这个可以当一般结论来记吗?

NO.PZ2019011002000004

问题如下:

Bond C is a 5-year corporate bond rated at AA. The table below shows the probabilities of a particular rating transitioning to another over the course of the following year.

Bond C will have a modified duration of 3.22 at the end of the year. According to the information above and assuming no default, how should the analyst adjust the bond’s yield to maturity (YTM) to assess the expected return on the bond over the next year?

选项:

A.

Add 0.091% to YTM

B.

Subtract 0.091% from YTM

C.

Subtract 0.120% from YTM

解释:

B is correct

解析:

考点:考察对Transition matrixes的理解和使用

表格最后一行显示了每一个评级下的Credit spread;由题干信息已知债券的Modified duration为3.22;

则从AA变动为AAA,债券价格的变动为:

-3.22×(0.60%-0.90%)=0.9660%

从AA变动为A,债券价格的变动为:

-3.22×(1.10%-0.90%)=-0.6440%

从AA变动为BBB,债券价格的变动为:

-3.22×(1.50%-0.90%)=-1.9320%

从AA变动为BB,债券价格的变动为:

-3.22×(3.40%-0.90%)=-8.050%

从AA变动为B,债券价格的变动为:

-3.22×(6.50%-0.90%)=-18.0320%

从AA变动为CCC,CC,C,债券价格的变动为:

-3.22×(9.50%-0.90%)=-27.69%

题干中的表格给出了AA级向每一个级别变动的概率,因此我们可以用概率乘以对应的债券价格变动:

0.015×0.966%+0.8800×0%+0.0950×(-0.644%)

+0.0075×(-1.9320%)+0.0015×(-8.050%)

+0.0005×(-18.0320%)+0.0003×(-27.69%)=-0.091%

则假设在没有违约的情况下,下一年的预期收益为YTM减去0.091%。

评级上升带来的Credit Spread下降程度要比评级下降带来的Credit Spread上升程度要小,又因为Duration公式前面有负号,所以一般YTM都是减小?

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已采纳答案

吴昊_品职助教 · 2024年06月28日

嗨,从没放弃的小努力你好:


是的,可以当作结论来记忆。具体结论可以参考基础班讲义P225页。

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努力的时光都是限量版,加油!

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