For nearly a year, the average used vehicle in the United States had been edging toward affordable again for millions of people. The relief felt belated and relatively slight, but it was welcome nonetheless.

From an eye-watering peak of $31,400 in April of last year, the average price had dropped 14% to $27,125 early this month.

Now, with the supply of used vehicles failing to keep up with robust demand, prices are creeping up again, with signs pointing to further increases ahead. So many buyers have been priced out of the new-car market that fewer trade-ins are landing on dealer lots. Deepening the shortage, fewer used vehicles are coming off leases or being off-loaded by rental car companies.

Average list prices for used car have edged up by about $700 in the past month, and Alex Yurchenko, chief data officer for Black Book, which tracks prices, expects them to keep rising at least into summer.

“If you have to buy a used vehicle,” he suggested, “right now would be a good time.”

Pete Catalano, a dealer in Independence, Missouri, near Kansas City, has been struggling to get his hands on enough affordably priced cars. Typically, Catalano and his daughter, who co-own Stadium Auto, would have about 50 vehicles on their used-car lot near Arrowhead Stadium. They now have only about half as many. Some of their rival dealers, Catalano said, enjoy a competitive advantage because they can afford to offer financing to buyers with poor credit.

Squeezed by higher prices for gasoline, groceries and utilities, many of Catalano’s customers can’t afford either new or late-model used vehicles. Some would-be buyers he knows are using tax refunds just to make ends meet instead of buying a needed car.

“A used inexpensive car is now becoming more and more of a luxury,” Catalano said. “What the market wants right now is not available, and that’s $3,000, $4,000 and $5,000 cars.”

Behind the vehicle shortage and inflated prices is simple supply and demand. Much of the problem stems from the surging prices of new cars. In February, according to Edmunds, the average new vehicle in the United States sold for nearly $48,000 — beyond the reach of many consumers.

Though the supply of new vehicles has inched up, they remain relatively scarce and expensive. Automakers still lack sufficient computer chips to produce enough vehicles to meet demand, a lingering consequence of pandemic-related supply shortages. Sales of new vehicles last year were about 3 million below normal levels. Fewer new-car sales mean fewer trade-ins, which mean fewer used vehicles for sale.

With used prices rising again, analysts say buyers who can afford to do so should buy soon. Auto loan rates may continue rising this year as the Federal Reserve keeps raising interest rates.

On used lots these days, bargains are hard to find. Even after accounting for the price drops of the past year, the average used vehicle remains about 35% above where it was before the pandemic erupted three years ago. At that time, the average price was $20,425.

Once the government sent stimulus checks to most American households, demand for autos rose as many people spent their money. As they did, the supply of used vehicles fell and prices surged. By early last year, the average used-vehicle price was more than 50% above its pre-pandemic point.

Worsening the shortfall was a scarcity of affordable new vehicles. Automakers were using their tight supply of computer chips to build pricier and more profitable SUVs and pickups. They built fewer affordable new models — a trend that sent more buyers to used-car lots. The result was increased demand and higher prices for used vehicles.

All of which left people like Carol Rice struggling to find a decent affordable used vehicle. Rice, 65, endured a long period of frustration while shopping for a used small pickup for her farm near Carbondale, Kansas. For six months, she found little.

“I’m retired, and I can’t afford to buy a new vehicle,” she said. “There weren’t that many used vehicles, and if there were used vehicles, they were quite expensive.”

Last month, she finally found a 2003 Ford Ranger on Catalano’s website that she liked and could afford. She bought it for $7,700. Though it’s 20 years old and has 140,000 miles on it, the Ranger is in solid condition and has the all-wheel-drive that Rice wanted.

“It was a good-looking vehicle, and the price was right,” she said.

In the immediate future, few analysts expect price declines for used vehicles. Catalano doesn’t foresee any sustained price drops for perhaps the next year or two.

Others say it’s hard to predict. Amy Gieffers, a senior vice president at Vroom, an online auto buying site, notes that some market forces could continue to keep supply down and prices up: Fewer trade-ins, less leasing, lower fleet sales by rental car companies.

On the other hand, she says, more expensive vehicles and higher loan rates could depress buyer demand. Eventually, dealers might be forced to cut prices.

“It’s really complex right now,” she said, “because you have some competing forces.”

Both Yurchenko of Black Book and Charlie Chesbrough, a senior economist at Cox Automotive, say they expect used-vehicle prices to rise through summer before easing slightly as part of a normal late-year depreciation cycle.

At the start of this year, Chesbrough said, he thought higher loan rates would chase away buyers from both the new and used markets. Instead, robust demand from affluent buyers for pricey late-model used vehicles has strengthened sales in the United States.

Many of these buyers are paying cash to avoid higher interest rates. Edmunds.com says the average loan rate on a used vehicle is now 11.3%, up from 8.1% when the Fed started raising rates a year ago.

Because demand is intense and vehicle supplies short, Chesbrough doesn’t foresee sales dropping even if the economy were to slide into a recession. Though many buyers with lower credit scores have left the market, sales remain solid.

With used-car inventories likely to remain crimped for the foreseeable future, Chesbrough doesn’t expect prices to ever fall back to near their pre-pandemic levels

“We just haven’t been creating enough personal transportation in the last couple of years,” Chesbrough said.