... 沽出未抵押期权 naked option writing 沽出认沽期权 write a put option 沽空 short selling ...
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haha write a put option 沽出认沽期权
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Buy a put option with a strike above the current price of the index and write a simultaneous put option that has the same expiration month although with a lower strike.
FORBES: Optional Opportunity
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