It was Wall Street’s worst day in more than a decade: Stocks plunged on Monday as a panic that began in the oil market made its way through the global financial system, adding to concerns from already rattled investors about the state of the global economy.

The S&P 500, already down 12% from its late February high, fell more than 7 percent on Monday. The sudden downdraft meant that trading in the United States was automatically halted early in the day — a rare occurrence meant to prevent stocks from crashing — but it resumed after a 15-minute delay. The Dow Jones industrial average fell 2,000 points.

The drop on Monday was the worst for stocks in the United States since December 2008, when the country was still reeling from the collapse of Lehman Brothers and the housing crisis that dragged the economy into a recession. It put the index close to 20% below its record high, a drop that would have ended the bull market for stocks that began exactly 11 years ago.

The market is moving. Most people should sit still.

The sell-off came after Saudi Arabia and Russia set off a price war for crude over the weekend. Oil prices already had been falling as investors fretted about a looming recession. On Monday, prices plunged more than 20 percent, their sharpest decline since the Persian Gulf war of 1991.

That led to a collapse in share prices of companies and businesses that service the oil and gas sector. Manufacturers and banks, which are sensitive to concerns about the economy, also tumbled.

Pacific Northwest stocks were not spared. Boeing, buffeted by concern about international travel as well as its regulatory woes, fell 13.4%. Among major companies based in the region, the worst hit included Weyerhaeuser, down 10.0%, and Zillow Group, down 9.2%. Microsoft and Amazon lost 6.8% and 5.3%, respectively.

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Financial markets have whipped around for weeks as investors struggled to quantify the economic impact of the spreading coronavirus: stocks have tumbled, oil prices cratered, and yields on government bonds reflected a sense among investors that there was worse still to come.

“Markets want to hear that the global economy is open for business, and the problem is, it isn’t easy to say that going forward,” said Patrick Chovanec, chief strategist at the investment advisory firm Silvercrest Asset Management.

In Europe, major stock benchmarks fell more than 7 percent. Shares ended sharply lower in Asia also.

As stocks fell, investors seeking a safe harbor pushed yields on government bonds to new lows. The yield on the closely watched 10-year U.S. Treasury bond, which falls as the price of the bonds rise, dropped below 0.5 percent, about half the level of just a week ago.

Trading was temporarily halted Monday morning. Here’s why.

Five minutes into the trading day in the United States on Monday, the S&P 500 plunged 7%t, setting off an automatic 15-minute trading halt known as a circuit breaker. Additional breakers would have been tripped at 13% and 20%.

Circuit breakers were introduced after the October 1987 Black Monday stock market crash as a way to provide time for reflection by temporarily halting the action on hectic days. The circuit breakers were revamped after the May 6, 2010, collapse in stocks that came to be known as the Flash Crash. Monday was the first time the current circuit breakers, which were established in 2013, were set off.

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Oil stocks cratered following crude’s plunge.

Shares in oil companies fell sharply Monday as the price of crude nose-dived.

Many small oil companies that are responsible for more than 15 percent of American oil production face bankruptcy if the price war between Saudi Arabia and Russia goes on for more than a few weeks, while larger oil companies will be challenged to protect their dividend payments.

In the United States, the 10 worst-performing stocks in the S&P 500 were oil producers. All of them were down more than 30 percent, with shares of companies like Marathon Oil and Apache Corporation down more than 40%.

Larger oil producers like Exxon Mobil and Chevron fell 12% and 15%.

Elsewhere, Saudi Aramco, the national oil company of Saudi Arabia, fell as much as 10%, the maximum amount allowed on the Riyadh stock exchange.

Royal Dutch Shell fell about 17%.

Shares in BP, based in Britain, and France-based Total were also lower.

Bank stocks also fell fast.

Banks were hit on Monday. Shares of the biggest lenders are down by more than 10 percent, with JPMorgan falling 13% and Bank of America dropping 14%.

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The selling is explained by several factors:

Tumbling interest rates squeeze banks’ profitability by lowering how much they can charge on loans.

With oil prices falling, smaller American oil companies could have a hard time repaying debt owed to big lenders.

The across-the-board hit to financial markets over the past few weeks means that bank trading desks could wind up reporting large losses. Plus, uncertainty about the economy could hurt the banking business in general as companies delay borrowing and spending.

Clorox and a handful of retail stocks rose.

Not everything is getting clobbered, and the stocks that are rising Monday also have a story to tell.

Among the handful of companies in the S&P 500 to climb on Monday is Clorox, the maker of disinfecting cleaners and wipes. Up almost 1 percent, the stock hit its highest level ever.

And two low-cost retailers that are inching higher also reflect worry, but in their case it might be about the economy: Dollar General was up about 0.6%, Dollar Tree was up more than 4%.

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The last time the United States fell into a recession, all three fared well as consumers focused on finding bargains and discounts and turned to retailers known for offering them.

White House invites Wall Street to D.C.

The White House has invited top Wall Street executives to a meeting in Washington. D.C., on Wednesday, as the coronavirus outbreak continues to wreak havoc on markets and sow economic anxiety, according to an official.

The meeting is expected to involve executives from big banks and senior administration officials, many of whom are scrambling to find ways to contain the economic fallout from the virus. It is not clear yet whether President Trump will attend.

While the meeting is expected to be purely a discussion, it is reminiscent of a similar moment in 2008, when Treasury Secretary Henry Paulson, Federal Reserve Chair Ben S. Bernanke and others summoned bank leaders to Washington and told them they would need to take a total of $125 billion worth of capital injections to shore up confidence in the banking sector.

Trump plays down the threat. 

President Trump continued to play down the economic impact from the outbreak, comparing the number of deaths from coronavirus with those from the flu and blaming the fallout on oil prices and the news media.

Trump’s economic advisers were expected to brief him on a menu of potential fiscal stimulus items, including targeted tax relief and paid sick leave for workers. Democratic leaders in Congress threw their support behind government-paid sick leave and increased spending on safety net programs.

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The administration also lifted tariffs put in place during the trade war with China on surgical gowns, masks, gloves, hand sanitizer and other medical products.

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The bull market for stocks may have finally met its match.

Some of the world’s most important financial markets crossed into, or flirted with, bear market territory on Monday. That could augur an ugly week for those holding the world’s wealth.

Japanese and Australian stocks finished bruising trading days down 20 percent from their recent highs — the technical definition of a bear market, the flip side of the go-go bull market that has inspired memorials to surging capitalism. The drops represent billions of dollars in losses for some of the most valuable companies in both countries.

Stocks in Germany, France and Britain plunged on Monday, putting all three well into bear market territory, and shares in the United States were close.

Bear markets are rare and are sometimes seen as a harbinger of tougher economic times to come. Some notable bear markets in the United States include the one that ushered in the global financial crisis in 2007 and the dot-com bust in 2000.

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Here’s what else is happening.

Apple’s iPhone sales in China dropped by about 60% to roughly 500,000 last month from a year ago, according to Chinese government data. Overall smartphone sales fell by roughly 56% in the country over the period.

Staff members at Vice Media Group were told to work from home on Monday after the company said that an employee in its Brooklyn office “may have been exposed” to the coronavirus.

For the third time in two weeks, the turmoil in the markets took Robinhood, the retail trading application, offline on Monday morning, infuriating customers who were unable to do anything while stocks plunged. Last week, the company said a surge in customer activity overwhelmed its back-end systems.

JetBlue said Monday that it was withdrawing its earnings estimates for the first quarter and 2020 because of “ongoing uncertainty” caused by the coronavirus, which has contributed to a rapid decline in airline bookings.

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