The Loop™ circular shopping system has officially launched its pilot program in the Mid-Atlantic region of New York, New Jersey, Pennsylvania, Maryland, and Washington, D.C., and has announced Kroger Co and Walgreens, respectively the country’s largest grocery retailer and one of the largest pharmacy chains, as the founding retailers in the U.S. The news came at a media event held at the offices of The World Economic Forum in New York City May 21.