Reuters: Wall Street edges lower; Walgreen weighs

[chris]

Wall Street edges lower; Walgreen weighs
      

NEW YORK (Reuters) - The S&amp;P 500 and the Nasdaq fell but the Dow was little changed on Monday the start of what is expected to be a light trading week ahead of Thursday's Christmas holiday as investors look ahead to corporate earnings and details on retail sales.<div class="feedflare">
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