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Kokonoi Hajime · 2024年07月28日

老师能不能再讲一下为什么要1-最后一个折现因子除以因子和

NO.PZ2019010402000060

问题如下:

The two-year Libor-based interest rate swap with semi-annual resets (30/360 day count). Based on the following information, the fixed rate of the swap is:

选项:

A.

2.4735%

B.

2.1659%

C.

4.3318%

解释:

C is correct

本题考察的是对利率互换进行定价。

i=1nPVi(1)=0.985222+0.966184+0.943396+0.917431=3.812233\sum_{i=1}^nPV_i\left(1\right)=0.985222+0.966184+0.943396+0.917431=3.812233

fixed swap rate = (1- 0.917431) / 3.812233=2.1659%

annulized: 2.1659% * 360/180 = 4.3318%

简单来说就是老师能不能再解释一下公式

1 个答案

李坏_品职助教 · 2024年07月28日

嗨,爱思考的PZer你好:


假设利率互换本金是1块钱,固定利率是C.

用B1,B2,B3,B4分别表示四个折现因子。B1表示t=0.5时刻的1块钱折现到0时刻的现值,B2表示t=1时刻的1块钱折现到0时刻的现值。

固定利率部分的现金流的现值之和 = C * B1 + C * B2 + C * B3 + (1+C)*B4,

浮动利率部分,因为浮动利率的折现率也是libor,和分子的利息率是一样的,所以浮动利率部分的现值之和 = 本金1块钱。


现在令固定利率和浮动利率这两部分的现金流相等,也就是C * B1 + C * B2 + C * B3 + (1+C)*B4 = 1,那么C = (1-B4)/(B1+B2+B3+B4)

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