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NEW YORK�(CNNMoney.com) -- Stocks rallied early Monday as investors welcomed the Treasury's much-anticipated plan to buy up at least $500 billion in bad bank assets, seeing it as a key step in stabilizing the financial sector.

The Dow Jones industrial average (INDU) gained 212 points, or 2.9%, about 40 minutes into the session. The S&P 500 (SPX) index rose 24 points, or 3.2%. The Nasdaq composite (COMP) added 42 points, or 2.9%.

"I think the markets are really embracing this step by Geithner and Obama," said Manus Cranny, market analyst at MF Global Spreads in London. "This really is a precipitous moment for the market."

But Cranny warned that Geithner needed to do a better job at delivering his plan than he has in the past, to avoid spoiling the rally.

"[Geithner's] last delivery was patchy at best, both in terms of style and substance," said Cranny. "He needs to look and sound a lot more confident about what he's tabling to us."

Treasury plan: The U.S. government said late Sunday that it will initially commit up to $100 billion to subsidize private investors' purchase of banks' so-called toxic assets, which have led to the seizure of the credit markets.

"Over time, by providing a market for these assets that does not now exist, this program will help improve asset values, increase lending capacity by banks, and reduce uncertainty about the scale of losses on bank balance sheets," Geithner wrote in an op-ed in the Wall Street Journal.

The aim of the public-private partnerships is to buy up at least $500 billion of bad assets, and possibly up to $1 trillion over time.

Peter Cardillo, chief market economist for Avalon Partners, said that futures are responding positively to the notion that the Obama administration is "being less hostile toward the private sector."

Economy: Sales of existing homes rose 5.1% in February, according to the National Association of Realtors. Sales were expected to slip to an annual rate of 4.45 million for February, according to a consensus of economist opinion from Briefing.com. Instead they rose to a seasonally adjusted annual rate of 4.72 million million units, up from a rate of 4.49 million in January. Still, February sales were down nearly 5% from year-ago levels.

Deals: Suncor Energy (SU) agreed to buy rival Petro-Canada (PCZ) for about $14.86 billion. The deal will expand the company's oil sand reserves and create Canada's biggest energy company. Suncor shares were little changed, while Petro shares jumped 20% in early trading.

World markets: Stocks around the world rallied as investors awaited full details of Geithner's plan. Japan's Nikkei gained 3.4% while the Hang Seng in Hong Kong surged 4%. In Europe, the FTSE 100, the CAC-40 in France and German's DAX added at least 1% in midday trading.

Oil and money: Oil rose 51 cents a barrel to $52.58. The dollar dipped versus the euro and the British pound, but rose against the yen.