NEW YORK — A rocky Monday that started with a plunge abroad reminiscent of 1987 ‘s crash swept around the world and pummeled Wall Street with steep losses, as fears worsened about a slowing U.S. economy.

The S&P 500 dropped 3% for its worst day in nearly two years. The Dow Jones Industrial Average reeled by 1,033 points, or 2.6%, while the Nasdaq composite slid 3.4% as Apple, Nvidia and other Big Tech companies dubbed the “Magnificent Seven” that used to be the stars of the stock market continued to wilt.

The drops were the latest in a global sell-off that began last week. Japan’s Nikkei 225 helped begin Monday by plunging 12.4% for its worst day since the Black Monday crash of 1987.

It was the first chance for traders in Tokyo to react to Friday’s report showing U.S. employers slowed their hiring last month by much more than economists expected. That was the latest piece of data on the U.S. economy to come in weaker than expected, and it’s all raised fear the Federal Reserve has jammed the brakes on the U.S. economy by too much for too long through high interest rates.

Professional investors cautioned that some technical factors could be amplifying the action in markets, and that the drops may be overdone, but the losses were still neck-snapping. South Korea’s Kospi index careened 8.8% lower. Bitcoin dropped below $54,000 from more than $61,000 on Friday.

Even gold, which has a reputation for offering safety during tumultuous times, slipped about 1%.

That’s in part because traders began wondering if the damage has been so severe that the Federal Reserve will have to cut interest rates in an emergency meeting, before its next scheduled decision on Sept. 18. The yield on the two-year Treasury, which closely tracks expectations for the Fed, briefly sank below 3.70% during the morning from 3.88% late Friday and from 5% in April. It later recovered and pulled back to 3.89%.

“The Fed could ride in on a white horse to save the day with a big rate cut, but the case for an inter-meeting cut seems flimsy,” said Brian Jacobsen, chief economist at Annex Wealth Management. “Those are usually reserved for emergencies, like COVID, and an unemployment rate of 4.3% doesn’t really seem like an emergency.”

Of course, the U.S. economy is still growing, the U.S. stock market is still up a healthy amount for the year and a recession is far from a certainty. The Fed has been clear about the tightrope it began walking when it started hiking rates sharply in March 2022: Being too aggressive would choke the economy, but going too soft would give inflation more oxygen and hurt everyone.

Goldman Sachs economist David Mericle sees a higher chance of a recession within the next 12 months following Friday’s jobs report. But he still sees only a 25% probability of that, up from 15%, in part “because the data look fine overall” and he does not “see major financial imbalances.”

Some of Wall Street’s recent declines may simply be air coming out of a stock market that romped to dozens of all-time highs this year, in part on a frenzy around artificial-intelligence technology.

“Markets tend to move higher like they’re climbing stairs, and they go down like they’re falling out a window,” according to JJ Kinahan, CEO of IG North America. He chalks much of the recent worries to euphoria around AI subsiding, with pressure rising on companies to show how AI is turning into profits, and “a market that was ahead of itself.”

Making things worse for Wall Street, Big Tech stocks tumbled as the market’s most popular trade for much of this year continued to unravel. Apple, Nvidia and a handful of other Big Tech stocks known as the ” Magnificent Seven ” had propelled the S&P 500 to record after record this year, even as high interest rates weighed down much of the rest of the stock market.

But Big Tech’s momentum turned last month on worries investors had taken their prices too high and expectations for future growth are becoming too difficult to meet. A set of underwhelming profit reports that began with updates from Tesla and Alphabet added to the pessimism and accelerated the declines.

Apple fell 4.8% Monday after Warren Buffett’s Berkshire Hathaway disclosed that it had slashed its ownership stake in the iPhone maker.

Nvidia, the chip company that’s become the poster child of Wall Street’s AI bonanza, fell even more, 6.4%. Analysts cut their profit forecasts over the weekend for the company after a report from The Information said Nvidia’s new AI chip is delayed. The recent selling has trimmed Nvidia’s gain for the year to nearly 103% from 170% in the middle of June.

Another Big Tech titan, Alphabet, fell 4.4% after a U.S. judge ruled Google’s search engine has been illegally exploiting its dominance to squash competition and stifle innovation.

All told, the S&P 500 fell 160.23 points to 5,186.33. The Dow sank 1,033.99 to 38,703.27, and the Nasdaq composite tumbled 576.08 to 16,200.08.

Specialist Dilip Patel works at his post on the floor of the New York Stock Exchange, Monday, Aug. 5, 2024. (AP Photo/Richard Drew)