The coronavirus epidemic in China and its calamitous impact on the Chinese economy are continuing to stoke fears that Beijing will fail to live up to its considerable purchasing commitments in the U.S.-China phase-one deal, though U.S. and Chinese officials as well as China’s state-run media continue to strike an optimistic tone. The epidemic has caused U.S. airlines to shut down flights to China and Chinese factories to cease production, among other effects, stymying both Chinese manufacturers and their need...