Pricing Problem Suspends Nasdaq for Three Hours - NYTimes.com

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"The United States stock market showed again on Thursday that it remained vulnerable to technological breakdowns even as regulators and market operators work to keep up with trading that is increasingly electronic and driven by speed.
The latest trouble shut down trading on the Nasdaq market and its more than 3,000 stocks — including some of the most popular among investors, like Apple and Google — for more than three hours Thursday afternoon."

Pricing Problem Suspends Nasdaq for Three Hours - NYTimes.com