keywords: wal mart sales stocks slump
text: Wal-Mart Sales Slump Sends Stocks Sliding NEW YORK - Wal-Mart Stores Inc.'s warning of disappointing sales sent stocks lower Monday, as investors' concerns about a slowing economy offset their relief over a drop in oil prices.    October contracts for a barrel of light crude were quoted at \$46.58, down 14 cents, on the New York Mercantile Exchange...