
Making Sense From stalling home prices to new reforms: Will U.S. housing activity pick up?
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Mar 10, 2026 John Sim, head of Securitized Products Research at J.P. Morgan, brings mortgage-market and housing supply-demand expertise. He walks through recent price slowdowns and regional risks. He breaks down current mortgage and ARM dynamics, how pending bank capital reforms could shave rates, and thresholds that might revive sales. Rental market fatigue and single-family versus multifamily trends also come up.
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Mortgage Rate Lock-Ins Cripple Supply
- Mortgage-rate lock-ins have materially constrained supply and demand since 2022.
- About 80% of borrowers had sub-4% rates in 2022, leaving many unwilling to list homes after rates rose ~300 bps.
Basel Changes Could Trim Mortgage Rates
- Potential Basel bank capital rule changes could lower bank mortgage pricing power and reduce consumer mortgage rates.
- John Sim estimates lower risk weights might allow banks to cut mortgage rates by as much as 25–45 basis points in practice.
Watch Small Rate Moves To Predict Sales
- Expect home-buying activity to respond sharply to rate declines; every 20 bps matters.
- John Sim suggests 30-year rates near 5.5% could push existing home sales above 4 million and 4.5% could reach ~5 million.
