An August survey of business supply managers suggested slow or no economic growth over the next several months in nine Midwest and Plains states, in part because of trade skirmishes. The Mid-America Business Conditions index dropped below growth neutral in August to hit 49.3, compared with 52.0 in July. The index had remained above growth neutral for 32 straight months. The survey results are compiled into a collection of indexes ranging from zero to 100. Survey organizers say any score above 50