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muamadove · 2022年05月06日

write OTM call为什么不能保护下行风险

NO.PZ2018111501000016

问题如下:

Raymond, a US analyst, is managing a fund with EUR-denominated assets. In order to protect the assets from downside return movement, he decides to use option contracts. However, he also wants to reduce hedging costs. Assume the fund performance is measured in USD, he will most likely choose to:

选项:

A.

buy an USD/EUR ATM put option

B.

write an USD/EUR OTM call option

C.

buy an USD/EUR OTM put option.

解释:

C is correct.

考点:Strategies to Modify Risk and Lower Hedging Costs

解析:

为了避免外汇资产下跌,应该买put option(注意是DC/FC的外汇报价方式),所以B选项排除。由于这个分析师需要降低对冲成本,那么选择OTM put option更符合他的要求。

write OTM call为什么不能保护下行风险?EUR下行的时候,获得一个premium



1 个答案
已采纳答案

Hertz_品职助教 · 2022年05月06日

嗨,努力学习的PZer你好:


同学你好~

我们在分析的时候就把外汇当做一个普通的资产即可,比如我们把它当做常见的股票来理解。

回想一下,我们说担心股价下跌,我们是不是采取的策略是long put,而没有说是short call的。为什么呢?

我们担心股价下跌,我们想要对冲风险,本质还是想消除掉不确定性,毕竟不确定性就是风险嘛(确切的说是不知道亏损多少的可能性)。

所以我们long put,该策略使得我们在股价下跌的时候的亏损是确定的(虽然有亏损,但是是确定的,消除了不确定性),而在股价上涨的时候是有收益的。

但是我们从来不用short call,虽然他在股价下跌的时候收益是正的,但是我们担心的事情如果没有发生的,股价反而涨上去了,此时我们的亏损可是无限的,这个策略说明我们并没有对冲掉风险,反而引入了更大的风险。这也是可以理解为什么我们说short call的裸头寸风险是很大的,所以要给他加上一个long stock头寸,构成covered call策略。

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努力的时光都是限量版,加油!

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