U.S. soybean prices inched up after marking their lowest in four months earlier in the session, but were still set for their biggest weekly loss since August 2017 amid expectations for bumper North American output. The most active soybean futures on the Chicago Board of Trade were down 4.5 percent for the week, on course for their biggest weekly slide since Aug. 4, 2017. Soybeans hit their lowest since Feb. 6 at $9.72-1/2 a bushel.