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GOLD SLIDE: Gold fell a fourth day in a row on persistent concerns about Europe's efforts to resolve its debt crisis. Gold ended at $1,577.20 an ounce. That's nearly $140 less than it was on Friday and about $323 less than last summer's high of $1,900 an ounce.

EUROPE WOES: Investors are concerned about the Europe's lingering financial problems and whether their impact on the global economy. Many sold gold for a profit or shifted money into cash and Treasurys.

MIXED BAG: Energy products, wheat, corn, soybeans and most metals also were lower.