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保过 · 2024年01月22日

分子,现金流,利息,为什么都等于0.0437?

NO.PZ2018123101000018

问题如下:

Jane is a bond trader for an investment bank. Exhibit 1 presents the current par and spot rates.

Note: Par and spot rates are based on annual-coupon sovereign bonds.

Based on Exhibit 1, the five-year spot rate is closest to:

选项:

A.

4.40%

B.

4.45%

C.

4.50%

解释:

B is correct.

考点:The Swap Rate Curve和Spot rate的关系

解析:

已知1-year, 2-year, 3-year, 4-year的Spot rate,也知道5-year的Swap rate,根据由Swap rate求Spot rate的方法,有公式:

1=0.0437/(1.025)+0.0437/(1.03)^2+0.0437/(1.035)^3+0.0437/(1.04)^4+1.0437/(1+S5)^5

S5=4.45%

分子,现金流,利息,为什么都等于0.0437?相当于所有现金流,都用了第5年的par rate?为啥分子现金流,不是根据每年PR

1 个答案

pzqa015 · 2024年01月22日

嗨,从没放弃的小努力你好:


par rate就是债券面值等于100时的ytm,此时ytm=coupon rate=par rate

用par rate可以通过迭代来计算出各个期限的spot rate

比如这道题

先用par rate1来迭代spot rate1

100=102.5/(1+s1),s1=2.5%

然后用par rate2来迭代spot rate2

100=2.99/(1+2.5%)+102.99/(1+s2)^2,s2=3%

用par rate 3来迭代spot rate3

100=3.48/(1+2.5%)+3.48/(1+3%)^2+103.48/(1+s3)^3,s3=3.5%;

。。。

以此类推

本题是省略了s1-s4的迭代过程,直接给了4个值,那么计算spot rate5的过程就是

100=4.37/(1.025)+4.37/(1.03)^2+4.37/(1.035)^3+4.37/(1.04)^4+104.37/(1+S5)^5


----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

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