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明明要加油 · 2023年09月30日

请问这道题为啥没有AI_T呢?

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.

我看答案求出了FVC,但是为啥没有AI_T呢?想不明白。

1 个答案

pzqa35 · 2023年10月04日

嗨,努力学习的PZer你好:


本题考察的是对fixed-income futures估值。

注意这道题目出的不是很严谨,解析中也有一些错误。关于本题,重点回顾对fixed-income futures定价的知识点,对答案和解析不必纠结。

首先,看一下选项中给的都是f0(T),但是具体的表达式中涉及到除以CF(1.098),因此可以推断题目本身要问的是QFP。

然后,根据题干信息可知:标的债券面值为$100,000,票息率为7%,半年付息一次,15年到期。并且告诉我们B0=$156,000,无风险利率为1.5%,合约还有8个月到期,CF为1.098。没有accrued interest。

具体分析:没有accrued interest,即AI0=0;半年付息一次,因此6个月的时刻会有一笔coupon。根据画图法可知,在0时刻:

向上的箭头为:B0+AI0-PVC=$156,000 + 0 – [$100,000*7%*1/2] / (1+1.5%)6/12;

向下的箭头为:FP+AIT向前折现8个月到0时刻的值,即QFP*CF+AIT向前折现8个月的值,具体为:[QFP*1.098+AIT] / (1+1.5%)8/12 ;

令向上箭头等于向下的箭头,可得:

选项A中忽略了AIT (即上面式子中分母位置的100,000*7%*1/2*2/6),因此选项A虽然是本题的答案,但是也是有些许问题的。

此道题不够严谨,忽略了AIT的计算,同学的理解是对的哦。同学能够发现这个问题,证明对于这个知识点的掌握还是非常扎实的,很棒!

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

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