The October producer price index fell 0.2% and the core rate also declined 0.2%, the Labor Department reported Wednesday.
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Economists polled by Thomson Reuters expected a 0.2% rise in the headline number and a 0.1% core increase.
Food prices rose 0.4% in the month, while energy prices fell 0.5%.
Intermediate goods dipped 0.1%, while core intermediate goods prices were unchanged.