Monday

An analyst upgrade of Wal-Mart stores and a partial comeback in the financial sector Monday afternoon helped the stock market post a fifth straight gain. Energy stocks were hurt by a dip in oil prices below $80 a barrel. The commodity and other natural resources, which are traded globally in dollar terms, were weighed down by a rally in the U.S. currency. The dollar was helped in part by early bets ahead of a Federal Reserve rate-committee meeting this week that may produce hints as to when the central bank might tighten the supply of dollars sloshing through the global economy. Along with the dollar, the yen gained, while the euro and the pound declined slightly. DJIA +17.46 Nasdaq -5.45 S&P 500 +.52.