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A Christmas wreath hangs above an entrance to the New York Stock Exchange (NYSE) in New York, U.S., on Monday, Dec. 5, 2016. U.S. stocks climbed, reversing a brief dip in early trading as Italian Prime Minister Matteo Renzi issued his resignation after voters there rejected a constitutional referendum. Photographer: Michael Nagle/Bloomberg via Getty Images

A Christmas wreath hangs above an entrance to the New York Stock Exchange (NYSE) in New York, U.S., on Monday, Dec. 5, 2016. U.S. stocks climbed, reversing a brief dip in early trading as Italian Prime Minister Matteo Renzi issued his resignation after voters there rejected a constitutional referendum. Photographer: Michael Nagle/Bloomberg via Getty Images