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If a trader believes that put implied volatility is relatively too high, compared to that for calls, a long risk reversal could be created by buying the OTM call(underpriced) and selling the OTM put(overpriced)for the same expiration. 请问可以在buyOTMcall或者buyITMput和sellOTMput或者sellITMcall之间任意buysell组合吗?而且,为什么在PPT的smilevolatility图示中,只标了两个OTM的option? 是出于成本价格的原因吗?好像sellITMcall比sellOTMput的premium会更高?
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