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白泽 · 2024年04月10日

不符合intuition

NO.PZ2018091706000045

问题如下:

Analyst Bob is studying foreign exchange market. He observes that:

1. The spot exchange market rate is 1.5500 USD/GBP for bid and 1.5505 for ask.

2. The 6-month forward rate is 1.5532 USD/GBP for bid and 1.5540 for ask.

So, Bob can get which of the following conclusions?

选项:

A.

The 6-month USD interest rate is less than the 6-month GBP interest rate.

B.

The 6-month USD interest rate is greater than the 6-month GBP interest rate.

C.

The 6-month USD interest rate is equal to the 6-month GBP interest rate.

解释:

B is correct.

考点:Interest rate parity

解析:根据利率平价理论,我们可以得到如下公式:

FUSD/GBP=SUSD/GBP(1+iUSD(180360)1+iGBP(180360))F_{USD/GBP}=S_{USD/GBP}{(\frac{1+i_{USD}{(\frac{180}{360})}}{1+i_{GBP}{(\frac{180}{360})}})}

现在分析师Bob观察到的结果是F>S。因此,等式右边(1+iUSD(180360)1+iGBP(180360))(\frac{1+i_{USD}{(\frac{180}{360})}}{1+i_{GBP}{(\frac{180}{360})}})这一项数值一定大于1。所以该项中分子的iUSDi_{USD} 分母的iGBPi_{GBP}。所以选B。

No.PZ2018091706000045 (选择题)


这道题,USD/GBP提高了,GBP升值,升值不应该说明利率更高吗?


因为利率高,相应货币会增值,为啥反而是USD利率更高?


1 个答案

笛子_品职助教 · 2024年04月11日

嗨,努力学习的PZer你好:


因为利率高,相应货币会增值,为啥反而是USD利率更高?

Hello,亲爱的同学~

根据利率平价公式(Interest rate parity),高利率的货币,会贬值,而不是升值。

利率平价公式是无套利均衡。

高利率的货币,投资者可以赚利差的钱。

因此,高利率的货币,就需要贬值,让投资者在汇率上亏钱。

利差赚的钱等于汇率亏的钱,最终不亏不赚。

不亏不赚,就是无套利均衡。



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

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