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Chicago Board of Trade November soybean futures, thinly traded ahead of the contract's expiration on Nov. 14, fell 22 3/4 cents or 1.5% to $15.04 1/4 a bushel, a more than two-week low.
Most-active January soybeans fell 23 1/2 cents or 1.5% to $15.03 1/4 a bushel.
Traders said market participants sold futures to exit bets on higher prices Monday, ahead of a U.S. Department of Agriculture report Friday expected to include a higher estimated yield for the U.S. soybean crop. A higher yield would somewhat ease concerns about tight supplies of soybeans after severe drought widely damaged U.S. crops over the summer.