英文名称：Variable Margin 中文名称：变动保证金变动保证金是由清算行或经纪商每日收取的由于市场的不利波动致使原保证金金额不足而需增缴的保证金，其额度与头寸的亏损程度成正比，并按当日收盘价计算头寸的损益情况得出。

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e.g. Gross margin decreased by $9 million to $250 million, primarily due to increased purchased electricity and fuel costs at Uruguaiana in Brazil and Gener in Chile and higher fixed costs at Gener, partially offset by the consolidation of Itabo and variable margin on the increased revenues in Argentina.