The rapid reversal in U.S.-China trade negotiations could have a long-term detrimental impact on global supply chains and was the center of our readers’ interest in May. The relative effectiveness of tariffs went in favor of the U.S. in March with a 29.2% drop in Chinese exports that have become subject to 25% duties in May from 10% in September. That may have contributed to the Trump administration’s increasing assertiveness on trade policy with regards to China, migration-related tariffs against Mexico and slow progress in negotiations with the EU. Corporate reactions to tariffs varied...