Why Real Rates May Not Return to Their Pre-2020 Lows

The 2010-2021 stretch of zero or negative real rates is widely read as the destination of a long structural trend. The BIS’s long-run series since 1870 suggest another reading: persistent shifts in real rates coincide with changes in monetary regime, which makes that stretch one regime among others.

The forces routinely invoked to forecast a return to those lows (aging populations, savings gluts, low productivity) cut both ways once examined in detail.

Real rates do not automatically return to low levels. Analysis of the demographic, productive and geopolitical factors that sustain them.

Each time real rates climb back toward positive territory, the same conviction resurfaces: structural forces (aging demographics, a global savings glut, declining productivity gains) will pull them back to the very low levels of the past decade. That reading dominated central-bank models and investor frameworks through the 2010s. Eco3min lays this out in this question on demographics structural inflation. It rests on a partial inventory. The same demographic shifts cited to justify low rates produce the opposite effect once one moves from the savings phase to the dissaving phase. Sizing the supply-demand balance for capital correctly is the first step in understanding why real rates govern the economy rather than merely reflecting it.

Demographics: A Two-Phase Variable, Not a One-Way Force

The conventional argument runs as follows: aging raises precautionary savings, weighs on consumption, depresses the natural rate of interest. That mechanism was visible from the 1990s onward, when the baby-boom cohorts were accumulating wealth ahead of retirement. It is not the mechanism currently at work.

According to Eurostat projections (EUROPOP2023), the old-age dependency ratio in the euro area rises from 35.0% in 2025 to 51.2% in 2050. Retirees draw down accumulated savings rather than build them; the supply of capital contracts at the margin. At the same time, age-related public spending widens government financing needs. The IMF Fiscal Monitor (October 2025) counts aging populations, alongside defence and higher interest rates, among the strains on public debt it describes as “high and rising”. The same demographic input, two decades later, produces upward pressure on real rates.

The New Demand-Side Drivers: Transitions, Reshoring, Defence

The energy transition mobilises capital at a scale that has no precedent in peacetime. In its net-zero scenario (Net Zero Roadmap, September 2023), the International Energy Agency puts required clean-energy investment at ≈$4.5 trillion a year by the early 2030s. Whatever the financing channel, that volume puts a structural floor under capital demand.

Geopolitical fragmentation pushes in the same direction. Partial reshoring of supply chains, rising military spending in Europe and Asia, duplication of strategic infrastructure: these absorb investment without proportionally raising productivity. The combination of demand-side pressures with a shifting supply-side picture explains why real rates remain sticky after a shock rather than reverting cleanly to a prior baseline. The broader cyclical context appears in our reading of equity-market upswings under an inverted yield curve.

What Seven Centuries of Real-Rate Data Actually Show

Schmelzing’s work for the Bank of England (2020) tracks real rates back to 1311 and finds a trend decline of 0.6 to 1.6 basis points a year; Schmelzing reads the low rates of the 2010s as a return to that trend. That is the strongest objection to this piece. The BIS long-run series since 1870 (Borio, Disyatat, Juselius and Rungcharoenkitkul, 2017) offer another reading: the link between real rates and saving-investment determinants appears tenuous, while persistent shifts in real rates coincide with changes in monetary regime. The finding also tempers the demographic argument, which weighs without deciding on its own. The quantitative side is handled in our examination of the delayed hit of rate hikes on earnings. On that reading, the 2010-2021 episode of near-zero real rates (a 0.22% average for the US 10-year inflation-indexed yield, Federal Reserve H.15) is the joint product of three identifiable conditions: an Asian savings glut, abnormally low inflation around a 2% target, and unconventional monetary policy at the zero lower bound. Two of them no longer hold in 2026: US CPI inflation stood at 3.4% year on year in August (BLS) and the effective federal funds rate at 3.88% on 2 October. Related coverage: our analysis of financial repression episodes.

If the structural forces currently at work are confirmed, the regime of positive real rates observed in 2026 plausibly persists rather than reverting: the US 10-year inflation-indexed yield rose from a 1.88% first-quarter average to 2.64% in September 2026, its highest monthly level since November 2008 (Federal Reserve H.15). That hypothesis reshapes how all participants read financial conditions under a higher-rate regime. The question for the next decade is less whether real rates fall back than which configuration of demographics, transitions and geopolitics they settle into.

Last updated — 6 October 2026