赵同学2023-11-23 14:55:12
老师请问这个case Q2答案里说 A short calendar spread is appropriate if the expectation is for a decrease in implied volatility or a big move in share prices that is not imminent. 这里的short calendar spread为什么适合a big move in share price that is not imminent?以后股价会有大move不是相当于以后vol会变大吗?
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Simon2023-11-23 17:36:10
同学,上午好。这段解析中a big move in share prices个人认为是有问题的。应该是通过a decrease in implied volatility that is not imminent,短期波动不会下跌,长期波动下跌,推出short calendar spread(买入短期option,卖出长期option)。
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老师那这里的Q2选Implied volatility错的点在哪里呀?我看题干有说股价decline sharply over the next month,如果股价在以后会急速下跌那也就是说在未来implied vol会增加,目前vol是不增加的,那就可以long calendar了。也确实是在vol上涨的时候是appropriate的
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错在only appropriate when implied volatility expected to increase。不管上涨和下跌,都可以用这个策略。如果implied volatility expected to increase(短期不涨,长期涨),可以long calendar spread,如果implied volatility expected to decrease(短期不跌,长期跌),那么short calendar spread。
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