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. - 
Listen To The Story
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."

Follow Mark Garrison at @GarrisonMark