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HUANGy · 2020年02月08日

问一道题:NO.PZ2018123101000027

问题如下:

Smith gathers information on spot rates for on-the-run annual-coupon government securities and swap spreads, as presented in Exhibit below.

Smith buys a four-year, zero-coupon corporate bond and then sell it after two years. Smith illustrates the returns from this strategy using the swap rate as a proxy for corporate yields. Smith should show a total return closest to:

选项:

A.

4.31%.

B.

5.42%.

C.

6.53%.

解释:

C is correct.

考点:考察Riding the yield curve策略

解析:由题干已知,Swap rate来代替公司债的收益率;四年期的Swap spread息差为0.70%,4年期的国债收益率Government spot rate 为4.05%,则4年期的swap rate = 4.05% + 0.70% = 4.75%。

因此,购买的4年期零息债券的价格为:

price=100(1+0.0475)4=83.058price=\frac{100}{{(1+0.0475)}^4}=83.058

两年期的公司债收益率为2年期的Swap rate, swap rate = 2.70% +0.30% = 3%,

4年期的零息债券持有2年后的卖出价格为:

price=100(1+0.0300)2=94.260price=\frac{100}{{(1+0.0300)}^2}=94.260

则这笔投资的年化总收益为:

94.26083.0581=0.0653=6.53%\sqrt{\frac{94.260}{83.058}}-1=0.0653=6.53\%

老师,为什么不用94.26-83.33/83.33这么求收益率呢

3 个答案

吴昊_品职助教 · 2020年09月02日

同学你好:

由于我们是复利计算,此类问题默认都是需要年化的。不过不用担心,考试的时候给出的措辞一定会更严谨。再者,这道题如果是算持有期收益率,三个选项也选不出正确选项。

吴昊_品职助教 · 2020年02月10日

由于我们是复利计算,此类问题默认都是需要年化的。除非持有一年,那么持有期收益率就是年化收益率。

吴昊_品职助教 · 2020年02月09日

嗨,爱思考的PZer你好:


你的计算过程算的是持有期收益率,而题目要我们求的是年化收益率。因为是复利计算,所以我们需要通过83.058(1+R)^2=94.26,反求出年化收益率。


-------------------------------
就算太阳没有迎着我们而来,我们正在朝着它而去,加油!


Jody · 2020年09月01日

Total return不应该理解为持有期收益率吗?题目中并没有明确是年化收益率呀。

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