Walmart strong again in second quarter, but its outlook is reserved

Walmart reported a strong second quarter with comparable sales in U.S. stores rising 2.6% and adjusted per share results of 81 cents, exceeding Wall Street expectations. However, the company's shares slid 6%, overshadowed by a more cautious outlook. For the full year, Walmart expects sales to be up anywhere from 4% to 5%, falling short of analyst predictions.