The Securities and Exchange Commission's new order-handling rules go into effect today (IMD, Dec. 2). The rules are expected to increase the volume of market data traffic. One requires the display of customer limit orders, and the other will change the way the SEC governs the publication of quotes. One observer says the rule will have "a massive impact on the vendors. It's going to be very interesting to see ... and I think the results are going to be a little surprising."

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