Walmart reports a great holiday quarter

Walmart posted surprisingly strong same-store sales for the quarter that ended in January, up 4.2 percent. The retailer has been through quite the turnaround over the past five years — at this point in 2014, Walmart had posted six straight quarters of declining or flat sales. But e-commerce, online grocery sales, and brick-and-mortar refurbishments have helped the retailer stay competitive against Amazon. 

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