保守些的 call spread or put spread ,spread 的好處是可以基本抵消 IV 效應,
這樣風險是可控的,可能的 max loss 事先就確定了
保守些的 call spread or put spread ,spread 的好處是可以基本抵消 IV 效應,
這樣風險是可控的,可能的 max loss 事先就確定了
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