January 29, 2012 5:00 AM

One of the few retail niches expanding: dollar stores

A few days after the New Year’s holiday, clerks at the Dollar Tree store in the St. Paul, Minn., Midway neighborhood were busily setting up new displays celebrating Valentine’s Day and Super Bowl Sunday. Any remnants of the Christmas holiday season were long stowed away, and the bright new merchandise enticed shoppers anew.

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