TAKING PRECAUTIONS: Investors remained concerned about the global economy. They sold copper to take profits ahead of a key U.S. jobs report due Friday that could shed more light the pace of U.S. economic growth. The price of copper has risen about 7 percent this year.

GAS GAINS: Natural gas climbed 7.2 percent after the government said supplies shrank last week. The price finished at $2.554 per 1,000 cubic feet, up about 23 cents from a 10-year low hit last month.

MIXED BAG: Gold, silver, platinum and palladium rose. Wheat and oil fell, but corn and soybeans were higher.