Blackberry Announces Largest Order Ever

March 14 (Bloomberg) -- Mark Barton reports today's top headlines. He speaks on Bloomberg Television's "Countdown." (Source: Bloomberg)

Fed's Yellen: Persistent Strains Could Weigh on Outlook
33:20 - Federal Reserve Chair Janet Yellen testifies about monetary policy and the U.S. economy before the House Financial Services Committee. She speaks on "Bloomberg Markets." (Source: Bloomberg)
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