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哄哄 · 2023年10月08日

AI0和AI_T计算

NO.PZ2023020101000011

问题如下:

They move to valuation of a bond futures contract employed by Sheroda. Parisi provides Curry with the following information for a Treasury bond and calculates the price of a futures contract on this bond. The bond has a face value of $100,000, pays a 7% semiannual coupon, and matures in 15 years. The bond is priced at $156,000, has no accrued interest, and yields 2.5%. The futures contract expires in 8 months, and the annualized risk-free rate is 1.5%. There are multiple deliverable bonds, and the conversion factor for this bond is 1.098.

Based on the information provided by Parisi, which of the following correctly calculates the futures price of the Treasury bond

选项:

A.

f 0 ( T )= [ $156,000 ( 1.015 ) ( 8/ 12 ) −$3,508.6958 ] /1.098 =$140,298.21.

B.

f 0 ( T )= [ $156,000 ( 1.015 ) ( 8/ 12 ) 3,491.325 ]/ 1.098 =$140,314.03.

C.

f 0 ( T )=1.098[ $156,000 ( 1.015 ) ( 8/ 12 ) $3,508.6958 ]=$169,144.08.

解释:

The futures price is calculated as follows:

f 0 ( T )= 1 /CF( T ) { FV[ B 0 ( T+Y )+A I 0 ]A I T FVC I 0,T }

There is no accrued interest, but the bond pays a $3,500 coupon in 6 months, so the future value of the coupon at expiration will be $3,508.6958 = 3500(1.015)(2/12).

f 0 ( T )= [ $156,000 ( 1.015 ) ( 8/ 12 ) $3,508.6958 ] /1.098 =$140,298.21.

老师,能不能讲讲这题两个Accrued interest的计算过程?然后刚刚做了一题AI是不用折现的,这题需要折现,想知道什么时候需要折现,什么时候不需要,可否画个图来说明一下?

1 个答案

李坏_品职助教 · 2023年10月08日

嗨,爱思考的PZer你好:


完整公式如下:

所谓AI_0,是因为full price = B0 + AI_0, AI_0是0时刻债券的dirty price中包含的accrued interest。

AI_T指的是在T时刻(期末)的accrued interest。


这里不存在折现的问题,你仔细看公式,这里是full price * (1+Rf)T,是从0时刻复利到T时刻,再减去AI_T。 你是不是把1/CF 看成折现了?

----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

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