They improve the quality of the prices on the exchanges by lowering the bid-ask spread.

它们通过降低买卖价差改善了交易所的价格质量。

youdao

The difference between bid and ask is the profit for the dealer and the bid-ask spread is the profit for the dealer.

中间商的利润来自出价和要价的差别，差价就是中间商的利润。

youdao

In a quote-driven market, bid-ask spread is composed of order processing costs, stock holding costs and asymmetric information cost.

在报价驱动交易机制下，买卖价差由指令处理成本、存货成本和非对称信息成本构成。

youdao

The difference between bid and ask is the profit for the dealer and the bid-ask spread is the profit for the dealer.

中间商的利润来自出价和要价的差别,差价就是中间商的利润

耶鲁公开课 - 金融市场课程节选

One issue for investors, according to Mr. Rosenbluth, is that this two-year-old fund is thinly traded and can have a wide bid-ask spread (the difference between the prices potential buyers "bid" to acquire shares and the prices potential sellers "ask" to part with theirs).

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The best way to protect yourself is to use limit orders when placing an order to buy or sell a stock or an exchange-traded fund. (See How Your Buy and Sell Orders Get Filled for more.) Look at the bid-ask spread and set your price limit at the bid for selling a stock and at the ask for buying a stock.

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On Tuesday, the bid-ask spread on Spain's 10-year note hit roughly 0.12 percentage point.

WSJ: Calm Market, Rough Trading