margin requirement to have a lot of cash. up and down, selling

来源: silentcreek 于 2017-06-28 08:19:00 [档案] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (0 bytes)

回答: 估计是做空股票期权由期权小玩家于 2017-06-28 08:10:41

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