"Portable" Mortgages Could Unlock the Housing Market, Says Economist Justin Wolfers

The Lead with Jake Tapper, CNN, November 13 2025 What happens when homeowners can take their old low mortgage rate with them to their next house? This conversation tackles the rising buzz around portable mortgages, why they might thaw a frozen housing market, and what banks would have to rethink if the U.S. followed Canada and Britain down this path. Wolfers lays out how mortgage "lock in" keeps people stuck, and why portability is simpler than it sounds. He makes the case that this new approach might shake loose badly needed supply in a locked-up market. Mortgage portability is all about solving the problem of mobility. But to solve the deeper problem -- of housing affordability -- he points out that different approaches are needed. He explains why expanding supply—not just juicing demand—is the real path to affordability. Topics covered: • Why portable mortgages reduce mortgage-rate lock-in • How moving your loan could free up desperately needed housing supply • Why Canada and the U.K. offer a useful model • How banks would adjust their risk models in a portable-mortgage world • Why existing loans create tougher complications • How 50-year mortgages echo the same demand-side logic • Why America’s housing crisis is driven by too few homes • The role of zoning in restricting supply • Why construction, not clever loans, is the true affordability solution Table of contents: 0:00 Why mortgage rates are freezing the market 0:34 What a portable mortgage actually means 1:20 How it works if you still owe money 2:32 What changes for banks 3:34 Are 50-year mortgages any better? 4:12 Why supply—not loans—fixes affordability 📈 Key takeaway: Portable mortgages help, but only more homebuilding solves the core problem. Subscribe for more straight-shooting econ that travels better than your mortgage, with Justin Wolfers.