“Where the rest of us see subway walls, Tesco's South Korean supermarket chain Home Plus sees grocery shelves. In a trial run, Home Plus has plastered a subway station with facsimiles of groceries, labeled with a unique code for each product. As commuters pass by on their way to work, they can use a mobile-phone app to take pictures of the products they want, then check out. The groceries are automatically delivered to their doorstep by the end of the work day.”


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