Markets remained unsettled on Wednesday as technology stocks continued to fall, dragging down stock indexes across the world for a second consecutive day.

       The market tumble that began in the United States on Tuesday continued across Asia and Europe as concerns about the global economy and major tech companies like Nvidia spread among investors.

       In the United States, the S&P 500 wavered on Wednesday, fluctuating between small gains and losses and ultimately falling about 0.2 percent, after a drop of more than 2 percent the previous day.

       Nvidia traded roughly flat before ending the day down about 1.7 percent. On Tuesday, the semiconductor giant’s stock plunged nearly 10 percent, erasing some $279 billion in market value, the biggest one-day decline for a U.S. stock on record.

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       A report released by the Labor Department on Wednesday showed that job openings in the United States fell below expectations in July, to 7.7 million, a decrease from a downwardly revised 7.9 million the previous month. It was another sign of the labor market cooling, a source of anxiety for investors monitoring the health of the U.S. economy.

       U.S. Treasury yields fell after the report, as traders bet that the Federal Reserve would announce a potentially bigger interest rate cut than had been expected when officials meet this month.

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