People living longer is actually making the world's debt more expensive, not cheaper.
April 16, 2026
Original Paper
Fiscal Demographic Reversal
SSRN · 6571423
The Takeaway
Standard economics says that as people live longer, they save more for retirement, which increases the supply of cash and pushes interest rates down. But in countries buried under high public debt, that relationship flips on its head. Long-lived populations put such an extreme strain on government spending—through pensions and healthcare—that it actually drives interest rates up to sustain the massive borrowing required. For the average worker, this means your longer lifespan isn't just a personal victory; it’s a macroeconomic force that makes mortgages and car loans harder to afford. It suggests that our aging society is heading for a financial collision that current models haven't accounted for.
From the abstract
We study how rising longevity affects the long-run real interest rate in an overlappinggenerations model with mortality risk and accidental bequests to the young. Longer lives increase retirement saving, which tends to lower the interest rate, but they also reduce such bequests and shift asset payoffs from young savers to surviving retirees, weakening aggregate saving. Public debt amplifies this second force. When debt is sufficiently high, further increases in longevity eventually raise the ste