Dollar weakens, stocks gain before Fed meeting; oil up

By Caroline Valetkevitch NEW YORK (Reuters) - The U.S. dollar weakened and world stock indexes rose on Monday as investors expected the U.S. Federal Reserve to leave interest rates unchanged this week, while oil prices bounced back from multi-week lows. U.S. Treasuries yields dipped as traders booked profits ahead of this week's Fed policy meeting as well as the Bank of Japan's policy meeting. Weak recent U.S. data has boosted bets that the Fed would skip a chance to raise rates at this meeting.