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Suechen · 2020年06月01日

问一道题:NO.PZ2016031002000031 [ CFA I ]

问题如下:

The following spot and forward rates have been given:

  • Current 1-year spot rate is 6%.
  • One-year forward rate one year from today is 8%.
  • One-year forward rate two years from today is 10%.

What's the value of a 3-year, 10% annual-pay, $1000 par value bond?

选项:

A.

$996.

B.

$1,055.

C.

$1,086.

解释:

B is correct.

lBond value=1001.06+100(1.06)(1.08)+1100(1.06)(1.08)(1.1){l}Bond\text{ }value=\\\frac{100}{1.06}+\frac{100}{(1.06)(1.08)}+\frac{1100}{(1.06)(1.08)(1.1)}\\=$1055.21

这道题给的是y1y2,我只算了100/1.06+1100/1.06*1.1,等于一年利率加上2年forward rate,这样算为什么不对

1 个答案

吴昊_品职助教 · 2020年06月02日

我不是很明白你说的“等于一年利率加上2年forward rate”这句话要表达的是什么意思。

首先这是个三年期债券,三年期债券annual-pay意味着有三期的现金流,而你的列式中只有两项现金流是不对的。

题目中给出的是一年期即期利率,S1=6%;站在1时刻的一年期远期利率,1y1y=8%;站在2时刻的一年期远期利率,2y1y=10%。给出的三个利率都是一年期的利率,而你列式的第二项,分母中只涵盖了两年,1时刻到2时刻是没有覆盖到的,而分子现金流却是第三年末的现金流,完全不匹配。

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