Buffett Apprentice$蔚来汽车 (NIO.US)我买了 22 号的 call，5 张， 但是估计会没意义，价格高了。那么我应该放弃行权就可以了吧，平仓。为啥今天系统邮件提示我注意保证金。账户上融资额度可能不够行权。放弃行权直接作废不行么，我是买方啊。请教大佬们，第一次搞期权
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