People walk by the Nasdaq stock market one day after the the electronic exchange experienced a a three-hour trading delay due to a technical problem on August 23, 2013 in New York City.
People walk by the Nasdaq stock market one day after the the electronic exchange experienced a a three-hour trading delay due to a technical problem on August 23, 2013 in New York City. - 
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Marketplace

In two critical minutes, Nasdaq's technology failed the world. One hundred and twenty seconds are under scrutiny in the investigation to find out what caused Nasdaq's giant freeze-up on Thursday after computer problems forced the exchange to halt trading for hours. Scott Patterson is a Wall Street Journal reporter trying to unravel what went wrong. He's also author of "Dark Pools: The Rise of the Machine Traders and the Rigging of the U.S. Stock Market."

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Follow Mark Garrison at @GarrisonMark