BIG emphasis on "may": > This is at the brain-storming stage, but it's possible > in a year or two," said Jeff McAllister, senior vice > president of W

BIG emphasis on "may": > This is at the brain-storming stage, but it's possible > in a year or two," said Jeff McAllister, senior vice > president of Walmart U.S. innovations. > Indeed, the likelihood of this being broadly adopted > across the company's network of more than 4,000 stores > in the United States is low, according to Matt Nemer, a > retail analyst at Wells Fargo Securities.