Despite experts' concerns that consumers were spending less as economic news worsened over the summer, Kantar Retail says that retail sales grew by 3.4% in August, better than the 2.9% same-store sales gain last month, and a happy improvement from the 2.4% decline in August of last year. The International Council of Shopping Centers says its index, which tracks a slightly different group of stores, posted a 3.2% year-over-year comparable-store gain, slightly above expectations.