BANGKOK--Japan’s Nikkei 225 surged 8 percent and other world markets also jumped Wednesday after Congress and the White House reached a deal to inject nearly $2 trillion of aid into an economy ravaged by the coronavirus.

The advances followed the best day since 1933 for the Dow Jones Industrial Average, which rocketed 11.4 percent higher on Tuesday.

Tokyo logged its biggest daily gain since 2008. Share prices there were lifted also by the decision to postpone the 2020 Olympics to July 2021 in view of the coronavirus pandemic, which has brought travel almost to a standstill and is leaving many millions of people ordered to stay home to help contain the outbreaks.

The postponement alleviated fears the event might be canceled altogether.

Shares were moderately higher in early European trading. Germany’s DAX climbed 2.6 percent to 9,953.60 and the CAC 40 in Paris picked up 2.3 percent to 4,339.67. Britain’s FTSE 100 added 2.7 percent to 5,591.41.

U.S. futures turned higher after U.S. lawmakers said they had bridged their differences over the stimulus package. The future for the Dow rose 1.7 percent to 20,960.00 and the contract for the S&P 500 picked up 0.7 percent to 2,454.60.

The gains this week have been a respite from a brutal month of nearly nonstop selling. But with cases of the virus still climbing, investors are leery of saying markets have hit bottom. Rallies nearly as big as this have punctuated the last few weeks, none lasting more than a day.

The breakthrough on the sweeping $2 trillion measure to aid American workers, businesses and a health care system strained by the rapidly spreading coronavirus outbreak was an expected but welcome boost to sentiment.

The deal was announced shortly after midnight and follows days of often intense haggling and mounting pressure. It still needs to be finalized in detailed legislative language, but would give direct payments to most Americans, expand unemployment benefits and provide a $367 billion program for small businesses to keep making payroll while workers are forced to stay home.

“Given the enormity of the package, it will most certainly be well initially well-received as it should be sufficient to avoid buttress ‘Main Street’ from falling into worst-case, depression type scenarios, especially with the Fed prepared to monetize all the U.S. government’s debt,” Stephen Innes of AxiCorp. said in a commentary.

Pressure was on Congress to act after the Federal Reserve has done nearly all it can to sustain markets.

Overnight, the Dow closed at 20,704.91, while the more closely followed S&P 500 index, which is vital for most 401(k) accounts, leaped 9.4 percent to 2,447.33. The Nasdaq composite jumped 8.1 percent, to 7,417.86.

Ultimately, investors say they need to see the number of new infections peak before markets can find a floor. The increasing spread is forcing companies to park airplanes, shut hotels and close restaurants to dine-in customers.

Earlier share rebounds have quickly evaporated. Since stocks began selling off on Feb. 20, the S&P 500 has had six days where it’s risen, and all but one of them were big gains of more than 4 percent. Afterward, stocks fell an average of 5 percent the next day.

And stimulus packages can be addictive, said Ipek Ozkardeskaya, a senior analyst at Swissquote Bank.

“Is this package an economic vaccine to the virus? It is too early to tell, but the kneejerk market reaction is rather cheery,” she said in a commentary. “The bigger the stimuli, the more investors demand.”

The VIX index, a proxy for equity market volatility, remains relatively high, “suggesting that underlying risk sentiment may stay cautious as investors remain wary on the pace of the infection spread, with total confirmed COVID-19 cases exceeding 400,000 globally,” Mizuho Bank said in a commentary.

On Wednesday, the momentum was all upward. Tokyo’s Nikkei closed at 19,546.63, while the Hang Seng rose 3.8 percent to 23,527.19. South Korea’s Kospi gained 5.9 percent to 1,704.76 and the S&P/ASX 200 gained 5.5 percent to 4,998.10. Taiwan’s benchmark jumped 3.8 percent. Shares were also higher in Southeast Asia.

India’s Sensex jumped 6.4 percent after Prime Minister Narendra Modi ordered the world’s largest democracy into the world’s biggest lockdown Wednesday. India’s 1.3 billion people were ordered to stay home in a bid to stop the coronavirus pandemic from spreading and overwhelming its fragile health care system as it has done elsewhere. Governments elsewhere have also tightened restrictions on business activity and movement as the toll from the virus has surged higher.

For most people, the coronavirus causes only mild or moderate symptoms, such as fever and cough. 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. Recovery could take six weeks in such cases.

It’s unclear how long-lasting the damage from the outbreak will be on economies. Governments and central banks in other countries around the world are unveiling unprecedented levels of support for their economies in an attempt to limit the scale of the upcoming virus-related slump.

Measures of the shock to the world economy are accumulating.

On Thursday, economists expect a report to show the number of Americans applying for jobless claims easily set a record last week. Some say the number could be way beyond 1 million, amid a wave of layoffs, topping the prior record of 695,000 set in 1982.

In other trading, U.S. crude oil gained 54 cents to $24.55 per barrel in electronic trading on the New York Mercantile Exchange. Brent crude, the international pricing standard, added 51 cents to $30.25 per barrel.

In currency trading, the U.S. dollar rose to 111.39 yen from 111.22 yen late Tuesday. The euro gained to $1.0831 from $1.0790.