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王平安 · 2021年06月20日

折现率疑问❓

  1. CFA II
  2. Fixed Income

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：

94.26083.058−1=0.0653=6.53%\sqrt{\frac{94.260}{83.058}}-1=0.0653=6.53\%

题目中并未说yield curve在未来保持不变啊，那怎么能用现在0时刻的2年期折现率，去计算2年后的价格，不是应该用2年末的future spot rate去计算价格吗？
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1 个答案

WallE_品职答疑助手 · 2021年06月20日

嗨，从没放弃的小努力你好：


折现是基于现在的即期利率，即期利率短到几个月，长到几十年，组成的一条利率曲线就是spot rate curve.


future spot rate是未来的即期利率，这些都是估计的，不是真实的利率，折现需要基于当下的利率来折现。


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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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NO.PZ2018123101000027 问题如下 Smith gathers information on spot rates for on-the-run annual-coupon government securities answsprea, presentein Exhibit below.Smith buys a four-year, zero-coupon corporate bonanthen sell it after two years. Smith illustrates the returns from this strategy using the swrate a proxy for corporate yiel. Smith shoulshow a totreturn closest to: A.4.31%. B.5.42%. C.6.53%. C is correct.考点考察Ring the yielcurve策略解析由题干已知，Swrate来代替公司债的收益率；四年期的Swsprea差为0.70%，4年期的国债收益率Government spot rate 为4.05%，则4年期的swrate = 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}=83.058price=(1+0.0475)4100​=83.058两年期的公司债收益率为2年期的Swrate, swrate = 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}=94.260price=(1+0.0300)2100​=94.260则这笔投资的年化总收益为94.26083.058−1=0.0653=6.53%\sqrt{\frac{94.260}{83.058}}-1=0.0653=6.53\%83.05894.260​​−1=0.0653=6.53% 题目里面算出swrate，可以用它来折现？但是课上说swrate是一种prate？prate我理解就是每期现金流/pincipal的一个比率，应该是用来计算分子的？所以swrate到底是什么？为什么可以用来折现算价格？

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