The US Labor Department reported that initial claims for unemployment insurance dropped to a seasonally adjusted 509,000, from an upwardly revised figure of 530,000 for the previous week. That was significantly below analysts' estimates of 537,000, according to a survey by Thomson Reuters.

The four-week average of initial claims, which smooths out fluctuations, increased to 524,500, also the highest level since December 1982, the department said.

The US work force is roughly 50 percent larger than it was in the early 1980s. As a result, the department said the proportion of workers continuing to receive jobless benefits matches a level reached 16 years ago, in September 1992, when the economy was slowly recovering from recession.

Fewer jobs, fewer factory orders and slowing construction have added up to a severe drop-off in energy use, sending crude prices plunging.

"People are waking up to the fact that there may not be much demand," said Phil Flynn, an analyst at Alaron Trading Corp.

There were signs that the economy continues to worsen.

On Thursday AT&T said it was slashing 12,000 jobs, or about 4 percent of its work force. Chemicals company DuPont said it will cut 2,500 jobs and media conglomerate Viacom Inc. said it will eliminate about 850 jobs.

Most retailers posted weak sales for November, despite a shopping boost the day after Thanksgiving. Wal-Mart beat Wall Street expectations and said falling gas prices may be bringing more people out to its stores. However, Costco Wholesale Corp., usually a strong performer, reported a bigger-than expected sales decline.

Oil prices fell even after central banks in Europe and elsewhere slashed interest rates in an effort to spark their economies.

Prices at the pump continued to decline, falling 1.4 cents overnight to $1.789, according to auto club AAA, the Oil Price Information Service and Wright Express. That price is down 60.2 cents from just last month.

Though there are signs that Americans are able to drive more with prices plunging, Flynn does not see enough demand to justify big increases in oil and gas prices.

"We have entered a new era of lower gasoline prices and oil prices," he said.

The Energy Department's Energy Information Administration said in its weekly report that natural-gas inventories held in underground storage in the lower 48 states fell by 64 billion cubic feet to about 3.36 trillion cubic feet for the week ended Nov. 28.

Analysts had expected a drop of between 61 billion and 66 billion cubic feet, according to a survey by Platts, the energy information arm of McGraw-Hill Cos.

In other Nymex trading, gasoline futures fell 7.2 cents to 96.95 cents a gallon. Heating oil dropped 7.49 cents to $1.5091 a gallon while natural gas for January delivery fell 33 cents to $6.017 per 1,000 cubic feet.

In London, January Brent crude tumbled $3.16, to $42.28 on the ICE Futures exchange.

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