NEW YORK >> Stocks are see-sawing between gains and losses in midday trading on Wall Street today, but the moves are more subdued than the wild jabs that have dominated recent weeks. At least for now.

The S&P 500 was up 1.5% after bouncing back from a loss of 3.3%. That would be a notable change in normal times, but the index has had eight straight days where it swung up or down between 4.9% and 12%.

Markets have been so volatile because investors are weighing the increasing likelihood of a recession on one hand against huge, emergency efforts by global authorities to support the economy on the other. Markets got more of each today.

The number of Americans filing for unemployment benefits jumped by 70,000 last week, more than economists expected, in one of the first signs of layoffs sweeping across the country. Wide swaths of the economy are grinding closer to a standstill, from the travel industry to restaurants, as authorities ask Americans to stay home to slow the spread of the virus. Another weak manufacturing report, this time in the mid-Atlantic region, added to the worries.

But the world’s largest central banks announced their latest efforts to support financial markets and the economy. The European Central Bank launched an expanded program to buy up to 750 billion euros ($820 billion) in bonds to support the economy, and the Bank of England cut its key interest rate to a record low of 0.1%.

The Federal Reserve unveiled measures to support money-market funds and the borrowing of dollars as investors in markets worldwide rush to build up dollars and cash. The dash for cash has strained markets, and sellers of even high-quality bonds say they’re having difficulty finding buyers at reasonable prices for how much they want to sell. Many of the Fed’s moves, which are getting revived after being used in the 2008 financial crisis, are aimed at smoothing out operations in such markets.

“They’re throwing everything at this, and it doesn’t seem to be as effective,” said Sal Bruno, chief investment officer at IndexIQ. The market will likely remain volatile until investors see more economic data that shows just how badly the outbreak is hurting the economy.

“They’re doing what they can, and i’m not sure what else they can do,” Bruno said.

The Dow Jones Industrial Average was up 146 points, or 0.7%, at 20,045 as of 11:25 a.m. Eastern time. It had earlier swung between a loss of 721 points and a gain of 244 points. The Nasdaq was up 2.9%

The S&P 500, which drives movements for most 401(k) accounts more than other indexes, is down roughly 29% since its record exactly a month ago and close to its lowest point since late 2018.

European stocks swung from gains to losses and back to gains. Asian markets dropped following the brutal 5.1% loss for U.S. stocks the prior day. Crude oil clawed back some of its steep losses from the day before, and benchmark U.S. oil rose back above $24 per barrel.

Ultimately, investors say they need to see the number of new infections stop accelerating for the market’s extreme volatility to ease.

The total number of known infections has topped 220,000 worldwide, including nearly 85,000 people who had recovered. The death toll has crept toward 10,000.

For most people, the coronavirus causes only mild or moderate symptoms, such as fever and cough, and those with mild illness recover in about two weeks. Severe illness including pneumonia can occur, especially in the elderly and people with existing health problems, and recovery could take six weeks in such cases.

Until the number of new cases peaks, investors will struggle with uncertainty about how much to pay for a stock, bond or commodity when they don’t know how long the economic downturn will last. Many economists expect a sharp drop in the economy, but they disagree on how long it will take to bounce back.

The hope is that all the emergency actions by central banks and spending by governments can provide support for the economy in the meantime and soften the blow. The Trump administration has pitched lawmakers on a program that could flood $1 trillion into the economy, including checks sent directly to households.

The New York Stock Exchange said late Wednesday that it will temporarily close its trading floor and moving to all-electronic trading beginning Monday after two employees tested positive for coronavirus. The exchange has also started medically screening all personnel who enter the building.