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The cooling housing market enters into the Great Deceleration

As states issued strict lockdowns two years ago, it was a foregone conclusion that the U.S. housing market would slump. After all, with the COVID-19 recession sending the unemployment rate to its highest level since the Great Depression in April 2020, how could residential real estate not sink? Only it didn't happen. By the summer of 2020, both the U.S. economy and housing market had flipped from recession into expansion.

Over the past two years, that pandemic housing boom has seen U.S. home prices soar 34.4%. That tops the biggest two-year jump in home prices (21.2%) posted in the run-up to the 2008 housing bubble. How could that happen? A perfect storm. In an effort to save the economy, policymakers juiced it during the pandemic with unprecedented fiscal and monetary support, including pushing mortgage rates to all-time lows. Those low rates were too good a deal for well-paid professionals who saw their jobs transition to remote to pass up, as they drove up home values in markets like Boise and Austin. They certainly had competition: The pandemic coincided with the five-year window (between 2019 and 2023) when millennials born during the generation's five largest birth years (between 1989 and 1993) hit the peak first-time homebuying age of 30. To top it off, a stock market at all-time highs during much of the pandemic had investors flush with cash and ready to park it into real estate.

But we could soon see that boom finally come to a close.

As data rolls in for April and May, it's clear that the pandemic housing boom is cooling—fast. We're now transitioning into a new phase, or as Fortune calls it: the Great Deceleration. Heading forward, the breakneck rate of home price growth is expected to enter into a period of deceleration.

"The housing market is clearly softening," Devyn Bachman, vice president of research at John Burns Real Estate Consulting, tells Fortune. "In some cases buyers have stopped searching for a home altogether."

Why is the U.S. housing market finally shifting? There are three main reasons.

First, the Federal Reserve has moved into inflation-fighting mode. The central bank has made it clear: Slowing inflation requires slowing down the red-hot housing market. That's why the Fed has put upward pressure on mortgage rates, which have climbed from 3.11% to 5.25% over the past five months. Rising mortgage rates rise cause "demand destruction" as would-be homebuyers get priced out.

Second, the overheated 2022 spring market has pushed us over the edge into what housing economists call an overvalued housing market. Last month, Fortune asked Moody's Analytics for its proprietary analysis of U.S. housing markets. The firm's data shows that 96% of regional housing markets are "overvalued" and have home prices that are above what local income levels can support. Simple economics dictates that home price growth (up 19.8% over the past year) can't outpace wage growth (up 4.8% over the past year) by wide margins forever. The housing boom, with help from soaring mortgage rates, may have finally gone too far.