By Christopher Rugaber | The Associated Press

Inflation jumped at its fastest pace in nearly 40 years last month, a 7% spike from a year earlier that is increasing household expenses, eating into wage gains and heaping pressure on President Joe Biden and the Federal Reserve to address what has become the biggest threat to the U.S. economy.

Prices have risen sharply for cars, gas, food and furniture as part of a rapid recovery from the pandemic recession that was fueled by vast infusions of government aid and emergency intervention by the Fed, which slashed interest rates. As Americans have ramped up spending, supply chains have been squeezed by shortages of workers and raw materials.

“Inflation ended 2021 very hot,” said Ben Ayers, senior economist at Nationwide. Ayers and other economists say prices may cool off some as snags in the supply chain ease, but inflation will remain elevated throughout 2022.

Inflation jumped at its fastest pace in nearly 40 years last month, a 7% spike from a year earlier that is increasing household expenses and eating into wage gains. (George Etheredge/The New York Times)

The Labor Department reported Wednesday that its measure of inflation that excludes volatile food and gas prices jumped 5.5% in December, the fastest such increase since 1991. Inflation rose 0.5% overall from November, down from 0.8% the previous month.

Nicole Pomije, a bakery owner in Minnesota, said she is increasing prices for her cookies because of surging costs for butter and other ingredients.

Her basic cookies were priced at 99 cents each, while premium versions such as white chocolate were selling for $1.50 each. But Pomije said she will have to bump up the prices of her basic cookies to the premium price.

“We have to make money,” she said. “We are a business. We don’t want to lose our customers. But I think we might.”

Rising prices have wiped out the healthy pay increases that many Americans have been receiving, making it harder for households, especially lower-income families, to afford basic expenses. Polls show that inflation has started displacing even the coronavirus as a public concern, making clear the political threat it poses to President Biden and congressional Democrats.

A significant portion of inflation is still being driven by pandemic-driven mismatches between demand and supply. Used car prices have soared more than 37% over the past year because new car production has been limited by shortages of semiconductors. New car prices jumped 1% in December and have soared 11.8% in the past year.

Clothing costs rose 1.7% just in December, its second month of sharp increases, and are up 5.8% from a year ago.

There was some relief last month. Gas prices dropped 0.5% in December, yet they are still 50% higher than a year ago.

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Most economists expect inflation to moderate once the omicron wave fades and as Americans shift more of their spending to services such as travel, eating out and movie-going. That would reduce the demand for goods and help clear supply chains, which are showing some signs of untangling.

Used car prices have soared more than 37% over the past year because new car production has been limited by shortages of semiconductors. New car prices jumped 1% in December and have soared 11.8% in the past year. (AP Photo/Nam Y. Huh)

At the moment, prices are still rising for rent, restaurant meals and groceries. These gains are being driven by strong demand from consumers, who are benefiting from a strong job market and rising wages. The unemployment rate fell to 3.9% last month.

In recent weeks, shortages and higher prices have cropped up at U.S. grocery stores. The omicron variant and severe weather have compounded labor and supply-chain problems.

Many restaurants have been passing along higher labor and food costs onto their customers. Darden Restaurants, the company that owns Olive Garden, LongHorn Steakhouse and other chains, said it increased prices by 2 percent at the end of last year and expects to bump them by another 4 percent over the next six months.

Darden CEO Gene Lee recently told investors recently that this is “the toughest inflationary environment we’ve seen in years.”

On Tuesday, Chair Jerome Powell told Congress that if it becomes necessary to fight high inflation more aggressively, the Federal Reserve is prepared to accelerate the interest rate hikes it plans to begin this year. Fed officials have estimated that they will raise their benchmark short-term rate, now pegged near zero, three times this year.

Those rate increases would likely increase borrowing costs for home and auto purchases as well as for business loans, potentially slowing the economy. The Fed is also ending its monthly bond purchases, which were intended to lower longer-term interest rates to encourage borrowing and spending.

The Fed’s pivot hasn’t quelled questions from economists and some senators about whether the Fed has acted too slowly to end its ultra-low-interest rate policies in the face of accelerating inflation.

In his testimony to Congress on Tuesday, Powell said the Fed mistakenly believed that supply chain bottlenecks that have helped drive up the prices of goods wouldn’t last nearly as long as they have. Once the supply chains were unsnarled, he said, prices would come back down.

However, Powell acknowledged that the supply problems have persisted. He noted that many cargo ships remain docked outside the port of Los Angeles and Long Beach, the nation’s largest, waiting to unload.

With the Biden administration facing public discontent over the rise in inflation, the president has said his administration’s investments in ports, roads, bridges and other infrastructure would help by loosening snarled supply chains.

“Supply chain issues pushed up inflation last year, and that won’t duplicate this year,” said Ryan Sweet, an economist at Moody’s Analytics.

But economists don’t expect inflation to fall all the way back to the Fed’s target level of 2%.

Leslie Preston, senior economist at TD Bank, forecasts prices will still be rising at a 3% pace at the end of this year.

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AP Business Writers Dee-Ann Durbin in Detroit and Anne D’Innocenzio in New York contributed to this report.