高频交易，在所有华尔街交易量中比例约为三分之二到四分之三，似乎使得价差更小了(买入价格和卖出价格之间的缺口)。

HFT, which accounts for two-thirds to three-quarters of all Wall Street volume, seems to have led to smaller spreads (the gap between bid and offer prices).

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其它挂牌货币的现汇买入价与现汇卖出价之间的价差不得超过0.5%；

The margin between the buying and selling rate of other currencies may not exceed 0.5%.

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