21.   Professional traders may find the continuous repricing of ETFs for bonds useful in large transactions, where tiny changes in price add up to big differences in profits.

22.   Professional traders, on the other hand, frequently sold stocks of the industries most affected by the terrorist attacks, such as airlines and travel-related firms.

23.   Professional traders now swap shares over an electronic trading system.

24.   Professional traders often spot slight discrepancies in price between two similar products, like a gold contract trading in London and one trading in New York.

25.   The company is under pressure to accelerate its growth even as many core products, like its financial-news terminals for professional traders, have begun to mature.

26.   The declining spreads are good for investors, according to professional traders and experts on market structure.

27.   The NYSE says decimal pricing would eventually deter dealers from trading in many stocks, while allowing professional traders to place their own orders ahead of their customers.

28.   The proposed London-Frankfurt exchange, which was to have been known as iX, had never gathered much support from professional traders.

29.   They say that professional SOES traders have subverted a system that was designed for small, individual investors.

30.   What happened, professional traders said, is that the U.S. markets have become bigger, more volatile, and more uncontrollable than ever before.