Soybean prices rose to a 7-week high, grinding upward for the third time in 4 sessions as hopes dimmed that a work stoppage by truckers in Brazil would soon be resolved. Truckers, angry over higher fuel taxes and low incomes, have this week been blocking roads in Brazil, stymieing the flow of soybeans from the country's inland farms to ports along the coast, and raising hopes that global importers may switch soybean purchases to the U.S. in the event of prolonged delays.