Family Dollar Stores operates a chain of self-service retail discount stores primarily for low- and middle-income consumers.

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The other reason that self-service app stores make sense is that the connectivity situation with smartphones and tablets.

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In October 2012 Urban Outfitters, a major retailer, announced that it will no longer have cash registers in its stores, instead equipping salespeople with iPod Touches and self-service iPads for their customers.

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The Pronto wine kiosk experiment, set to begin in 24 Walmart stores in Pennsylvania this summer, may be the next step in the self-service revolution spreading across U.S. and globe.

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