World shares are mixed ahead a decision by the U.S. Federal Reserve on interest rates. European markets opened higher after a mixed session in Asia. U.S. futures edged higher while oil prices slipped. On Tuesday, the S&P 500 gained 0.5% to its highest level since early 2022, slightly below its record high, after a report showed inflation in the United States is behaving pretty much as expected. The Dow rose 0.5% and the Nasdaq composite added 0.7%. Traders still expect the Federal Reserve to stand pat on interest rates when it announces its next move Wednesday afternoon.