HOT FORECAST: Corn prices rebounded on forecasts calling for hot weather across much of the Midwest. Traders speculated that the higher-than-normal temperatures could cause crop conditions to deteriorate in some states, tightening supplies.
ALL ABOUT DEMAND: Questions about a global economic slowdown are keeping pressure on commodities. There is more evidence that the U.S. economy is weakening. China's economic growth is slowing and Europe is mired in a financial crisis. The combined problems are creating concerns about future demand for commodities.
UP AND DOWN: Prices for oil, natural gas and wheat rose. Gold, silver, soybeans and copper fell.