Summary Box: Corn climbs on improving export sales

    BACK ON TRACK: Corn prices rose sharply on a rise in U.S. export sales. Investors also are monitoring forecasts calling for hot weather that could affect corn in parts of the growing region.

    DEMAND EASING?: The Labor Department’s weak jobs report raised questions about the pace of economic growth. Investors are concerned that could weaken demand for commodities such as oil and industrial metals.

    GOLD-SILVER: Gold and silver, which are viewed as stable stores of value, rose. Many investors buy them when they are worried about instability in other markets.