Wal-Mart made its name by going big: massive super centers with gallon jars of pickles and rows and rows of lawn chairs and tires.

Its future may depend a lot on going small. It's investing in smaller stores in densely populated urban neighborhoods, where customers buy fewer items at a time.

Customers like Donna Thomas, who walked over to a Wal-Mart near Capitol Hill in Washington, D.C., on her lunch break from her job as an executive assistant at Comcast.

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