In late 2023, mortgage rates peaked at 8%. While they’ve let up some, today’s 30-year fixed mortgage rate is 6.75%, according to Mortgage News Daily. Economists and real-estate groups have warned they don’t see that figure budging much in the near future. And to make matters worse, some have said the mortgage rate it would take to make homes feel affordable again isn’t achievable. 

On Tuesday, Zillow economic analyst Anushna Prakash reported mortgage rates would need to drop to 4.43% for a typical home to be affordable to an average buyer. But “that kind of a rate decline is currently unrealistic,” Prakash wrote. Meanwhile, not even a 0% interest rate would make a typical home affordable in New York, Los Angeles, Miami, San Francisco, San Diego, or San Jose, she added. 

Warren Buffett’s Berkshire Hathaway HomeServices also said in an early July report that mortgage rates are one of the main deterrents for both home buyers and sellers.

“Many homeowners are reluctant [to] put their homes on the market and give up the low mortgage rates they already have,” according to Berkshire Hathaway HomeServices. “To them, high price gains won’t mitigate their ability to pay more for another home at significantly higher interest rates.”

This issue is also referred to as golden handcuffs—or the locked-in mortgage rate effect. The idea is that current homeowners have no incentive to put their homes on the market, even if they want to move, because they’d forgo a much lower mortgage rate they had locked in years ago. 

This causes a litany of other problems in the housing market, namely inventory.

The number of unsold existing homes for sale rose 9% month-over-month in April, according to Berkshire Hathaway HomeServices, to 1.45 million; that’s equal to 4.4 months’ supply on hand at the current sales pace and the highest level in five years. That’s shown itself in more sellers delisting their properties after sitting on the market for longer than expected.

“Homes are sitting on the market nearly three weeks longer than last year,” Realtor.com Senior Economist Jake Krimmel recently told Fortune. “That’s a sign of sellers still anchored to pandemic-era prices even though the market is telling them otherwise.” 

That doesn’t mean there’s an influx of housing in the U.S.; in fact, we’re still short millions of units. It just means there aren’t enough people who can actually afford to buy a home.

The factors influencing housing affordability

Although inventory levels are increasing, home prices and mortgage rates continue to be a roadblock for potential home buyers. Mortgage rates have remained “stubbornly high,” Berkshire Hathaway HomeServices said, deterring new buyers from the market.

According to a Realtor.com report published Thursday, the typical home spent 58 days on the market in July, which is 7 days longer than the same time last year. 

Mortgage rates are certainly a factor among buyers when deciding to make an offer, and home prices are also up more than 50% since the onset of the pandemic, according to the U.S. Case-Shiller Home Price Index.

All the while, wages haven’t grown at the same pace as home appreciation, making buying a house feel even more unaffordable. And if nothing changes like mortgage rates, inventory, or wage growth, it’s likely the housing affordability crisis in the U.S. will persist, Alexandra Gupta, a real-estate broker with The Corcoran Group, told Fortune.

“Some first-time buyers are turning to long-term renting or even co-living models because the idea of owning a home has become so out of reach. Others are relying more on family support to get into the market,” Gupta said. “We’re seeing a reshaping of the housing ladder.”

The small glimmer of hope, though, is home price growth appears to be slowing, according to the Case-Shiller indices.

“With affordability still stretched and inventory constrained, national home prices are holding steady, but barely,” Nicholas Godec, head of fixed-income tradables and commodities at S&P Dow Jones Indices, said in a statement.