NO.PZ201601050100000402
问题如下：
2. Given her investment goals and market view, and assuming all options are based on SEK/CHF, the best strategy for Björk to manage the fund‘s CHF exposure would be to buy an:
选项：
A.ATM call option.
B.ITM call option and write an OTM call option.
C.OTM put option and write an OTM call option.
解释：
C is correct.
The fund holds CHF-denominated assets and hence Björk wants to protect against a depreciation of the CHF against the SEK, which would be a down-move in the SEK/CHF cross rate. An OTM put option provides some downside protection against such a move, while writing an OTM call option helps reduce the cost of this option structure. Note that Björk does not expect that the SEK/CHF rate will appreciate, so this option (in her view) will likely expire OTM and allow her to keep the premia. This hedging structure is known as a short risk reversal (or a collar) and is a popular hedging strategy.
A is incorrect because the ATM call option will not protect against a depreciation in the SEK/CHF rate. An ATM option is also expensive (compared to an OTM option). Note that Björk does not expect the SEK/CHF rate to appreciate, so would not want a long call option position for this rate.
B is incorrect because this structure is expensive (via the long ITM call option) and does not protect against depreciation in the SEK/CHF rate.
中文解析：
持有外币CHF的资产，担心CHF贬值，因此他需要long put来提供保护，另外它又想降低成本，因此short call。
如果CHF升值，并且超过了我们卖掉的call option的执行价格时，对手方会行权，我们会失去超过行权价以上的收益，但是题干说了他相信即便上涨也是limited的，因此不会出现大幅上涨造成很大损失的情况。所以我们选择short 了一个OTM的call。
另外买一个OTM的put虽然保护的力度不如买一个ATM的put，但是OTM的put必然会便宜一些，这也会降低成本。
A,B选项明显错误。
老师，确认一个点，就是汇率A/B形式下，所有变动描述是不是都是针对B来说的？比如本题中说，SEK/CHF有一个limited upside potential, 其实就是指CHF升值也是有限的？
