...人银行部门就 他的交易曝险 （ trading exposure ）方面，多次向他提供“不正确资料”，导致他误以为按金盈余（margin surplus）比实际上多，而买入更多外汇合约。
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Many issues such as margin, flexibility, consumer surplus in economics relate to this important method — limit thinking.
经济学中的边际、弹性、消费者剩余等许多问题，都涉及到极限思想这一重要方法。
Customer surplus is the margin between the highest price the customer wills to pay for a certain amount of goods and their real market price.
消费者剩余，是指消费者消费一定数量的某种商品愿意支付的最高价格与这些商品的实际市场价格之间的差额。
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