交易实行的是保证金制度，而保证金的比率通常相当于合约总值的百分之十左右。价格波动大一点，两三个涨停板或跌停板就亏过头了。所以，在资金运用的过程中，必须留有余地，量力而为。总有人想一口吃个胖子，如果看对了，就能大赚一笔。但是，世界上的事情是没有绝对的，价格的涨跌永远是波浪式的。且不说有时会冒出一件突发消息使行情逆转，就算一波反弹，暂时性出现浮动损失，到了追加保证金的程度，因后援无继，缺乏第二套本钱，你就要被迫断头认赔了。等到风浪一过，行情大幅回升，就只有懊悔莫及的份儿了。事实也证明，这样做的后果都是一时贪了小便宜，最终吃了大亏。
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