There's a new 'hot-button' issue on Wall Street, and battle lines are being drawn

REUTERS/Brendan McDermid "Information wants to be free," the technology activist Stewart Brand once said. "Information also wants to be expensive." That is proving true on Wall Street, where stock exchanges — in particular the New York Stock Exchange and Nasdaq — both publicly traded and for-profit, stand accused by rivals and some users of unfairly increasing the price of market data. The debate centers on whether that data is essential — some customers and rivals say it is, the exchanges...