趙同學(xué)
2023-11-23 14:55老師請問這個(gè)case Q2答案里說 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. 這里的short calendar spread為什么適合a big move in share price that is not imminent?以后股價(jià)會(huì)有大move不是相當(dāng)于以后vol會(huì)變大嗎?
所屬:CFA Level III > Derivatives and Currency Management 視頻位置 相關(guān)試題
來源: 視頻位置 相關(guān)試題
1個(gè)回答
Simon助教
2023-11-23 17:36
該回答已被題主采納
同學(xué),上午好。這段解析中a big move in share prices個(gè)人認(rèn)為是有問題的。應(yīng)該是通過a decrease in implied volatility that is not imminent,短期波動(dòng)不會(huì)下跌,長期波動(dòng)下跌,推出short calendar spread(買入短期option,賣出長期option)。
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追問
老師那這里的Q2選Implied volatility錯(cuò)的點(diǎn)在哪里呀?我看題干有說股價(jià)decline sharply over the next month,如果股價(jià)在以后會(huì)急速下跌那也就是說在未來implied vol會(huì)增加,目前vol是不增加的,那就可以long calendar了。也確實(shí)是在vol上漲的時(shí)候是appropriate的
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追答
錯(cuò)在only appropriate when implied volatility expected to increase。不管上漲和下跌,都可以用這個(gè)策略。如果implied volatility expected to increase(短期不漲,長期漲),可以long calendar spread,如果implied volatility expected to decrease(短期不跌,長期跌),那么short calendar spread。
