NEW YORK—The U.S. Department of Agriculture is likely to buy sugar in the domestic market this year in order to drive prices up and prevent defaults on loans made to sugar processors, according to a USDA economist.

The USDA estimates it would need to buy 400,000 tons of sugar to boost prices to an "acceptable level," said Barbara Fecso, an economist at the department. A purchase of 400,000 tons would amount to about 4.4% of projected U.S. sugar production in the marketing year that ends Sept. 30.

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