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SHAO · 2023年04月19日

老师,请问我的理解哪里出错了?

NO.PZ2016022702000007

问题如下:

A one-year zero-coupon bond yields 4.0%. The two- and three-year zero-coupon bonds yield 5.0% and 6.0% respectively.

The five-year spot rate is not given above; however, the forward price for a two-year zero-coupon bond beginning in three years is known to be 0.8479. The price today of a five-year zero-coupon bond is closest to:

选项:

A.

0.7119.

B.

0.7835.

C.

0.9524.

解释:

A is correct.

1(1.06)3=0.8396\frac1{{(1.06)}^3}=0.8396

The forward pricing model can be used to find the price of the five-year zero as

P(T*+T)=P(T*)F(T*,T), SO P(5)=P(3)F(3,2)= 0.8396 x 0.8479 = 0.7119.

考点:forward pricing model

首先将即期利率转化成即期价格P(3)= 1(1.06)3=0.8396\frac1{{(1.06)}^3}=0.8396。通过forward pricing model得到五年期零息债券的价格,即P(T*+T)=P(T*)F(T*,T),所以P(5)=P(3)×F(3,2)=0.8396×0.8479=0.7119。

老师您好,我是这么算的:

第一步:0.8479=1/f(3,2),得到f(3,2)=0.086

第二步:P0=1/(1.04*1.05*1.06*1.086*1.086),得到P=0.7325

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已采纳答案

pzqa015 · 2023年04月21日

嗨,爱思考的PZer你好:


不应该是(1+s1)(1+s2)(1+s3)....,spot rate之间不能相乘。spot rate和forward rate之间的关系如下,以3段为例。

(1+s1)(1+f(1,1))=(1+s2)^2

(1+s1)(1+f(1,2))^2=(1+s3)^3

(1+s1)(1+f(1,1)(1+f(2,1)=(1+s3)^3

(1+s2)^2*(1+f(2,1))=(1+s3)^3

如下图


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就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

pzqa015 · 2023年04月19日

嗨,努力学习的PZer你好:


第一步错了

0.8479=1/(1+f(3,2))^2,而不是1/f(3,2)


用0.8479直接乘1/(1+s3)^3,得到的就是1/(1+s5)^5,也就是5年期的债券价格。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

SHAO · 2023年04月20日

不好意思,写错了,第一步是按您写的那样算的。所以我的算法是哪里理解有误吗?

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