Wall Street woes: ‘Brexit’ rattles trading-floor nerves

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There are worries about a financial fallout following the U.K.’s decision to leave the EU. After the Dow plunged, wiping away more than $800 billion of value following the “Brexit” results, NBC’s Olivia Sterns tells TODAY the first place people will feel the impact is in their 401(k). (Run time: 2:02)