The Lock-In Effect Is Still the Most Powerful Force in Housing
Millions of households hold mortgages below 4% and would have to roughly double their interest cost to move, which is why transaction volumes stay depressed even as inventory improves.
The single most consequential fact about the American housing market has nothing to do with prices or with construction. It is that a very large number of households are financially penalized for moving.
Mortgages originated between 2020 and early 2022 carry rates in the 2s and 3s. Current rates are near 6.7%. A homeowner who sells and buys a comparable house takes on roughly double the interest cost for the same amount of debt.
What that does to the market
It removes both a seller and a buyer from every transaction that does not happen. Someone who would have traded up stays put, which means their current house never lists and the house they would have bought stays with its owner.
The effect compounds through the chain. A first-time buyer needs a starter home to come available, which requires its owner to move up, which requires the next owner to move on. Freeze one link and the whole chain stalls.
That is the mechanism behind the past three years: not a shortage of houses in absolute terms, but a shortage of houses in motion.
Who moves anyway
Three groups transact regardless of rates. Those facing life events — divorce, death, job relocation, a growing family that no longer fits. Those with substantial equity, particularly older owners downsizing, for whom the mortgage rate barely matters. And those who bought recently at higher rates, who have nothing to lose by refinancing into a similar rate.
The market that exists is composed almost entirely of these three groups.
Why it will take years to unwind
Lock-in fades in two ways. Rates fall toward the level of existing mortgages, or time passes and the existing loans get paid down and refinanced through life events.
Neither is fast. Forecasters expect rates to end the year around 6.4% to 6.5%, which is not close enough to change the calculation for a household with a 3% loan. And the natural turnover of mortgage stock takes the better part of a decade.
The implication is that low transaction volume is the new normal for a while — with consequences for everyone whose income depends on transactions: agents, lenders, title companies, movers, and the furniture and home improvement retailers who sell to people who have just moved.
