The week that ended on June 5, 2010, saw U.S. chain-store sales increasing by 3 percent, from the same period last year, reports say. When compared on a weekly basis, the chain store sales rose by a mere 0.8 percent, nevertheless signaling an upward market trend. %% Reports state that the warm weather conditions have spurred retail sales in the apparel section. Overall sales are expected to increase between 3 percent to 4 percent year-on-year, throughout June 2010.