WASHINGTON - A record plunge in gasoline prices pushed overall consumer prices down for the third straight month in December, closing out a year in which the change in inflation was the smallest in more than a half-century.

Concerns remain low about possible deflation, but represent a marked change from just six months ago when soaring energy prices threatened to trigger a widening inflation problem that many analysts believed the U.S. Federal Reserve would have to fight by raising interest rates.

The Labour Department said Friday that consumer prices dropped by 0.7 per cent in December, slightly smaller than the 0.9 per cent drop economists expected.

For the year, consumer prices edged up by just 0.1 per cent, the smallest annual change since consumer prices actually fell by 0.7 per cent in 1954. Consumer prices rose by 4.1 per cent for all of 2007.

The big improvement over 2007 occurred because of the sizable declines in energy prices in recent months.

Excluding volatile food and energy prices, so-called core inflation was unchanged in December. For the year, it was up a moderate 1.8 per cent, compared with a 2.4 per cent increase for all of 2007.

For December, gasoline prices fell by 17.2 per cent, the largest monthly decline on records that go back 71 years.

Overall energy prices also were down by a record amount, falling by 8.3 per cent as home heating oil and natural gas also showed declines.

For 2008, energy prices were down by 21.3 per cent, with gas costs down by 43.1 per cent. Food costs were unchanged in December, and rose by 5.8 per cent for all of last year.

The sizable slowdown in overall inflation gave consumers more spending power. Average weekly earnings, after adjusting for inflation, showed an increase of 2.9 per cent last year, a big improvement from 2007 when average weekly earnings fell by one per cent.

However, the typical household may not feel those benefits as they watch the value of their homes and stock holdings plunge, and see job layoffs soar.

The big declines in overall prices in recent months came after soaring energy and food prices in early 2008. But the worst financial crisis since the 1930s sent the economy into a tailspin in the fall. The Fed is now focused on trying to ensure the financial turmoil does not push the country into a severe and prolonged recession.

The Fed cut a key interest rate to nearly zero last month and economists believe it will keep rates at that level over the next year, until the economy begins to show signs of recovering.

"Inflation is way down on the list of worries right now," said David Wyss, chief economist at Standard & Poor's in New York. "The worry right now is getting the economy to rebound."

Any Fed worries about inflation have evolved into concerns about possible deflation, a prolonged bout of falling prices, which has not been seen in the U.S. since the Great Depression.

Wyss ranked the possibility of deflation as low, but said the risk could rise significantly if the current financial crisis and recession worsen significantly in coming months.

To keep that from occurring, President-elect Barack Obama has pushed Congress to release the second half of the US$700-billion financial rescue package, gaining a victory on Thursday when the Senate rejected an effort to block release of the second $350 billion.

Obama also wants Congress to pass a sweeping economic stimulus bill. House Democrats, working closely with Obama, on Thursday unveiled a proposal calling for $825 billion in federal spending and tax cuts over the next two years to revive the moribund economy.

Economists believe inflation will slow even further this year as long as oil prices don't shoot up again. While a global recession is expected to depress energy demand, analysts said a supply disruption in the volatile Middle East is always a threat that could send prices higher.

Oil prices are more than $100 per barrel below their all-time high of $147 a barrel hit in mid-July. Average gas prices are around $1.80 per gallon, compared with $3.05 a year ago, according to auto club AAA, the Oil Price Information Service and Wright Express. Analysts predict gas prices will fall in coming months, further helping to contain inflation.

While the big drop in prices at the pump acts like a tax break, giving consumers money they can spend elsewhere, the weak economy and soaring layoffs are keeping them from spending in other areas. That has translated into tough times for the nation's retailers.

This week alone, department store chain Gottschalks Inc. put itself up for sale and said it had filed to reorganize in a Chapter 11 bankruptcy, discount clothing chain Goody's Family Clothing filed for Chapter 11 protection, luxury retailer Tiffany & Co. lowered its year-end profit forecast and Neiman Marcus Group Inc. said it was cutting about 375 jobs. Last week, Macy's Inc. said it will close 11 underperforming stores in nine states, affecting 960 employees.

Also last week, Wal-Mart Stores Inc. reported smaller-than-expected sales gains in December. Other retailers, including Sears Holding Corp., which operates Sears and Kmart stores, Saks Inc. and Gap Inc. reported big sales declines, wrapping up the worst holiday shopping season in at least four decades.