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李梦璐 · 2022年09月23日

去年的unexpected inflation作用

NO.PZ2018091701000019

问题如下:

An investor proposes buying a one-year government zero-coupon bond with face value of $100 and priced at $97.5, investor also collected some market information, the one-year real risk-free rate at 1.56% and unexpected inflation is 2.12% last year, please calculate the implied expected inflation rate for the one-year government zero-coupon bond:

选项:

A.

1.1%

B.

-1.1%

C.

2.5%

解释:

B is correct.

考点计算公式P t= ( C F t+s )/( 1+ l t,1 + θ t,1+ π t,1 ) s

解析根据题干提供的已知变量倒推出未知变量θ97.5=100/(1+ 1.56%+θ+2.12%)

       可以计算出θ=-0.011 or -1.1%

老师,这里unexpected inflation is 2.12% last year这个去年的预期外通胀率为什么要加上呢?这里计算的不是今年的预期通胀率么?跟去年的有什么关系呢?

1 个答案

星星_品职助教 · 2022年09月23日

同学你好,

risk premium除了risk-free rate 和要计算的expected inflation之外,还包括 inflation uncertainty(即unexpected inflation)

本题中的2.12%就相当于inflation uncertainty的部分,或者说由去年的unexpected inflation来推测今年的inflation uncertainty。

所以要加上这一部分,具体而言,本题的risk premium=risk free rate1.56% + expected inflation + unexpected inflation2.12%。这部分的总和为100/97.5 - 1

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