by John BIERS © Agence France-Presse NEW YORK, United States (AFP)–Walmart shares surged Thursday after it reported the strongest US comparable sales in more than a decade as e-commerce investments paid off in a strengthening American economy. The world’s biggest retailer said rising online sales, and investments aimed at keeping prices low, boosted store traffic at its namesake US business, the most critical unit for earnings. Comparable US store sales rose 4.5 percent in the second […]