Shares of industrial and transportation companies fell amid fears about the outlook for U.S.-Chinese trade negotiations. Shares of trade-sensitive companies such as Caterpillar and Boeing were higher after the opening bell, but retreated after reports that Chinese officials had cancelled a trip to U.S. farmland. "Every time there's a headline that questions the viability of an agreement with China," trade-sensitive stocks "just get hammered," said Quincy Krosby, chief market strategist at Prudential Financial. Office-furniture maker Steelcase rose after it posted quarterly sales and profit growth in excess of Wall Street targets.
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