The stock market plunged today, diving along with investors' confidence in the economy.

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NEW YORK — The stock market plunged today, diving along with investors’ confidence in the economy. Confirmation that the nation is in a recession and reports of only a modest gain in holiday shopping sales prompted many investors to resume selling after the market’s five-session advance.

The Dow Jones industrial average slid 679.95, or 7.7 percent, to close at 8,149.09. The Standard & Poor’s 500 index dropped 80.03, or 8.9 percent, to 816.21, while the Nasdaq composite index fell 137.50, or 9 percent, to 1,398.07.

Late-session comments by Treasury Secretary Henry Paulson that the economic downturn is “significant” but manageable likely added to the market’s gloom, as did more downbeat data about manufacturing and construction.

The market began the day sliding on initial reports that the holiday shopping season, while better than some retailers and analysts feared, was mixed — a sign that Americans are very reluctant to spend. That has Wall Street concerned about the impact of a continuing drop in consumer spending on the sagging economy.

Meanwhile, downbeat economic reports on the manufacturing sector and construction spending only added to investors’ concerns.

The day’s news reminded investors, who last week were buying on a burst of optimism, that the economy is still in serious trouble. And at midday, Wall Street had confirmation of what everyone has suspected for months: The nation is indeed in a recession. The National Bureau of Economic Research, considered the arbiter of when the economy is in recession or expanding, said the U.S. recession had begun a year ago, in December 2007.

That assessment made the retail sales figures all the more unnerving.

“Unfortunately, two-thirds of the American economy is based on the spending of the American consumer,” said Mike Stanfield, chief executive of VSR Financial Services. “When the consumer pulls back, it’s very hard for the economy to gain much traction.”

Investors had been hopeful that last week’s rally — when the major indexes shot up by double-digit percentages — was a sign that some stability had returned to a market badly shaken by months of discouraging economic data. But analysts expect economic concerns to weigh on the market for some time to come.

“Everyone knows the recession is on us, the question is now will it be short and shallow or long and severe,” Stanfield said.

Chuck Widger, chief executive of investment management firm Brinker Capital, expects the volatility to continue until investors have better visibility on the future.

“Investors are looking for better data on the economy,” he said. “We’ve got baked in pretty nasty assumptions for the economy this quarter. The markets are looking ahead to the first quarter for data that will confirm or deny the bad news.”

Bond prices rose. The yield on the benchmark 10-year Treasury note, which moves opposite its price, fell to 2.72 percent from 2.92 percent Friday. The yield on the three-month T-bill, considered one of the safest investments and an indicator of investor sentiment, slipped to 0.01 percent from 0.05 percent Friday. The lower the yield, the more anxious investors tend to be.

Federal Reserve Chairman Ben Bernanke said in a speech today that further interest rate cuts are “certainly feasible,” but warned there are limits to how much such action would revive the economy. The central bank’s key interest rate now stands at 1 percent, a level seen only once before in the last half-century.

Many economists predict policymakers will drop the rate again at their next meeting on Dec. 15-16. And, there have certainly been enough weak economic news to compel the Fed to make another cut.

Both the housing and manufacturing sectors have been suffering for some time, so today’s economic reports were ultimately unsurprising, although they added to the market’s gloom. The Institute for Supply Management, a trade group of purchasing executives, said its index of manufacturing activity fell to a 26-year low in November. Meanwhile, the Commerce Department said construction spending fell by a larger-than-expected amount in October.

Stanfield also said investors have lost some confidence in recent moves by the government to bolster the financial system. “The financials are still lagging, which in my opinion shows a lack of confidence in (Treasury Secretary) Paulson and the undertaking of the Fed and the Treasury,” he said.

Analysts say investors have been frustrated by the government’s change in strategy as it implements its $700 billion financial bailout program; the Treasury originally said it would buy soured mortgage debt from banks, then decided to buy stock in the banks.

Light, sweet crude dropped $5.15 to settle at $49.28 a barrel on the New York Mercantile Exchange after OPEC decided not to cut production at an informal meeting in Cairo on Saturday. The Organization of Petroleum Exporting Countries, which accounts for about 40 percent of global supply, reduced output quotas in October by 1.5 million barrels a day.

The dollar fell against other major currencies. Gold prices also fell.

Overseas, Japan’s Nikkei stock average fell 1.4 percent. At the close, Britain’s FTSE 100 was down 5.2 percent, Germany’s DAX index was down 5.9 percent, and France’s CAC-40 was down 5.6 percent.