"They do not force you to cover right away " Might want to read their fine print. They may not ask you to cover right away....but, they may do it for you. Here is part of a letter I got the other day. "Market conditions could force us to liquidate your account with or without notification, regardless of your intent to cover the amount required. A forcible liquidation may result in a $25 sellout fee in addition to the applicable commission charges. " BTW, it is done like a market price buy.
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