5 things to know about a possible "Brexit"

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    LONDON -- Britain will make a momentous decision on June 23 -- whether or not to stay in the European Union -- that will have wide-ranging consequences for businesses.

    Though the vote is still far off, the prospect of months of uncertainty has unnerved investors, who have pushed the currency, the pound, to seven-year lows.

    Some major businesses have come out vocally in support of the campaign to stay in the 28-country bloc, but popular sentiment is in flux. And senior politicians, including the mayor of London, have come out in favor of leaving, suggesting the debate will be hard fought.

    Here's a broad look at the risks investors and businesses are worried about.