NYSE Euronext and Nasdaq OMX Group will delay expansion of their limit-up/limit-down system by a few days because of concerns over how the program will function at the end of trading. The program is designed to prevent problems similar to the crash of May 2010 by putting a 15-second delay on trades if buy or sell orders do not fall within a certain price band. The system has been in place for most of the trading day.

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