The S&P 500’s main sectors were all trading sharply lower midday Thursday, highlighting the depth of a decline in equity markets. The 11 sectors of the S&P 500 SPX, -2.07% were all down by as much as 1%, with financials XLF, -3.35% and energy sectors XLE, -3.37% down by at least 3.5%, leading the drop. The move comes as investors have been sensitive to signs of an economic slowdown that could upend a multiyear bullmarket and longstanding expansion in the U.S. Tumbling crude-oil prices CLF9, -3.12% also have been spotlighted as a sign of those worries, since oil prices tend to fall sharply when expectations for demand drop. The Dow Jones Industrial Average DJIA, -2.40% and the Nasdaq Composite Index COMP, -1.28% also were trading sharply lower on the day. Both stock and bond markets were closed on Wednesday to mark a national day of mourning for George H.W. Bush, the U.S.’s 41st president, who died at 94.

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