The Dow and S&P 500 finished at new 5-year highs Tuesday, as investors grew hopeful about a potential merger between OfficeMax and Office Depot. The Dow Jones industrial average rose 0.4%, while the S&P 500 added 0.7%. The Nasdaq gained 0.7% to close at its highest level since November 2000. Inv…

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Dow and S&P close at new 5-year highs
