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小小圆仔 · 2024年02月13日

risk reversal 和collar

NO.PZ2022123002000025

问题如下:

Evelyn Weismann, a CFA Level I candidate, is a research analyst at Bay Area Investments, which specializes in derivatives and currency management. Bluerock Holdings, a US-based firm and an institutional client of Bay Area, is looking to increase its footprint in international markets. Bluerock is in the process of conducting due diligence to acquire Concord Associates, which is domiciled in London. Concord Associates has overall holdings amounting to GBP 400 million. Liam Mason, CEO of Bluerock, meets with Weismann and expresses his intention to mitigate the GBP currency risk before closing on the acquisition of Concord. Weismann makes the following three recommendations:

Recommendation 1: Implement an ATM call option on GBP/USD to protect the exposure against appreciation of the base currency.

Recommendation 2: Implement a risk reversal strategy by buying an ATM GBP/USD call option and buying an OTM GBP/USD put option.

Recommendation 3: Use a knock-in/knock-out option to receive an all-or-none asymmetric payoff when the exchange rate touches a pre-specified level.

Which of Weismann’s recommendations is most likely correct?

选项:

A.

Recommendation 1

B.

Recommendation 2

C.

Recommendation 3

解释:

Correct Answer: A

Recommendation 1 is correct.

If the base currency, USD, is appreciated against GBP, then the Concord Associates’ holdings of GBP 400 million will buy fewer USD in the future when the acquisition is completed.

The hedge is implemented in protecting against an appreciation of the base currency of the P/B quote, the USD. The hedge is established with an ATM call option (a long position in the USD).

P/B refers to the price of one unit of the base currency, “B,” expressed in terms of the price currency, “P.”

Recommendation 2 is incorrect.

Risk reversal, also referred to as a collar strategy, is created by buying stock and by simultaneously buying puts to protect the position against downside risk and selling calls to offset the cost.

Recommendation 3 is incorrect.

All-or-none asymmetric payoff is characteristic of a binary option and not a knock-in/knock-out option.

risk reversal是collar吗?collar不是short call和long put吗?为什么强化班讲义中implied volatility中long risj reversal是long call和short put啊?





1 个答案

pzqa31 · 2024年02月13日

嗨,从没放弃的小努力你好:


总结一下:

(1)关于collar和risk reversal

① 如果题目说collar又称作risk reversal策略,这是与教材一直的,看教材截图中蓝色突出的部分,说明教材没有对二者作明确的区分;

② 但在绿色突出的部分,教材的表述是short risk reversal用来构建了collar策略,这是比较严谨的说法。

因为collar = long stock +long put + short call,其中long put + short call构成了 short risk reversal策略,即collar相比于short risk reversal策略是包含了现货头寸的,所以二者并不一样。

③ 应对:如果题目信息中涉及到collar又叫做risk reversal的表述,可以认为没有问题;但遇到比较collar和risk reversal策略,则需要按照上面的②进行严格的区分。

(2)关于risk reversal

由教材中的表述(黄色和绿色突出)可知,教材对risk reversal策略也进行了划分,分为long /short risk reversal

① long risk reversal=long call + short put 。

② short risk reversal=long put +short call 。其中collar是相比于short risk reversal策略多一个现货头寸。

③ 粉色突出的内容,说明多数情况下,使用的是short risk reversal策略,所以如果遇到无法判断long或者short头寸的时候,可以先把他当作short 头寸去理解。

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