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我是一条鱼 · 2020年02月24日

问一道题:NO.PZ2018123101000077 [ CFA II ]

问题如下:

RW bond pays 4% coupon annually. It has a maturity of three years, and it is a callable bond that could be exercised at par at the end of years 1 and 2. To value and analyze RW’s bonds, Hsu uses an estimated interest rate volatility of 15% and constructs the binomial interest rate tree provided in Exhibit below:

Rayes, a senior analyst, asks Hsu to determine the sensitivity of this callable Bond price to a 20 bps parallel shift of the benchmark yield curve. The results of Hsu’s calculations are shown in the table below:

The effective duration of RW’s callable Bond is closest to:

选项:

A.

0.76.

B.

1.88.

C.

3.77.

解释:

B is correct.

考点:考察Effective duration概念

解析:

题干条件已经给定了Benchmark yield平行移动时,债券价格的变动,当Benchmark yield 上升20bps时,债券价格为100.478,当Benchmark yield降低20bps时,债券价格为101.238;根据有效久期的公式,可得有效久期为:

101.238100.4782×(0.0020)×(100.873)=1.88\frac{101.238-100.478}{2\times(0.0020)\times(100.873)}=1.88

注意题干中并没有给定利率变动前的债券价格,即PV0(分母中的100.873),但是可以通过二叉树模型,计算出PV0

如下所示: 

题目里没有写Call price 就默认为100吗?
1 个答案

吴昊_品职助教 · 2020年02月25日

“and it is a callable bond that could be exercised at par at the end of years 1 and 2”题干中说可以在第一年末和第二年末以面值赎回,所以call prcie才是100.

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NO.PZ2018123101000077 问题如下 RW bonpays 4% coupon annually. It ha maturity of three years, anit is a callable bonthcoulexercisepthe enof years 1 an2. To value ananalyze RW’s bon, Hsu uses estimateinterest rate volatility of 15% anconstructs the binomiinterest rate tree proviin Exhibit below:Rayes, a senior analyst, asks Hsu to termine the sensitivity of this callable Bonprito a 20 bps parallel shift of the benchmark yielcurve. The results of Hsu’s calculations are shown in the table below:The effective ration of RW’s callable Bonis closest to: A.0.76. B.1.88. C.3.77. B is correct.考点考察Effective ration概念解析题干条件已经给定了Benchmark yiel行移动时,债券价格的变动,当Benchmark yiel上升20bps时,债券价格为100.478,当Benchmark yiel低20bps时,债券价格为101.238;根据有效久期的公式,可得有效久期为101.238−100.4782×(0.0020)×(100.873)=1.88\frac{101.238-100.478}{2\times(0.0020)\times(100.873)}=1.882×(0.0020)×(100.873)101.238−100.478​=1.88注意题干中并没有给定利率变动前的债券价格,即PV0(分母中的100.873),但是可以通过二叉树模型,计算出PV0。如下所示 对比另一个题目NO.PZ2018123101000086中的如下没有call protection perio可债券在任何时刻都可以被call回(包括零时刻),所以零时刻的价格也无法超过100如果本题没有说明可行权的时间,默认是按照期初也能行权的思路(即期初不能 100),还是期初不能行权的思路(即期初可以 100)呢?

2024-07-20 17:27 1 · 回答

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