This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com.Caterpillar, DuPont are among big companies lowering expectations for a post-Covid-19 boomThe U.S.
produces more corn than any other crop and American farms sold $5.3 billion of it to China last year. But China has spent years courting other producers and it is exploring ways to become self-sufficient long-term. Illustration: Annie Zhaois damaging the fortunes of big American companies deeply rooted there, with some growing increasingly pessimistic that the country’s long-awaited postpandemic boom will materialize.