Low Rates and Growth: When Stimulus Becomes Drag

The standard reading that low rates mechanically lift growth treats the link as linear and permanent. The eurozone’s decade of negative real rates says otherwise — distortions accumulate, and beyond a certain duration the stimulus reverses into a drag.

What the post-2012 record shows is not that easy money failed outright, but that it stopped working — and started actively damaging the channels it was meant to feed.

Persistent low rates do not deliver growth automatically. The case for non-linearity, capital misallocation, and the reversal threshold.

The proposition that cheap money supports growth is one of the least contested in policy discourse. The chain of reasoning is short: lower funding cost, more investment, faster activity. The eurozone tested that premise for a full decade. Between 2012 and 2022, real rates stayed negative, and average real GDP growth came in at ≈1.4% per year (Eurostat). Productivity slowed, R&D capex did not scale, and the share of fragile firms climbed. The coincidence is striking enough to warrant looking past the textbook channel and reconsidering how real rates structure capital allocation in the first place.

The reasoning stops at the first round

The direct channel is real: lower rates cut financing costs, and projects at the margin of viability become viable. The same pattern shows up across cycle phases, as the analysis of inverted-curve episodes and subsequent equity rallies documents. But the offsetting effects are routinely skipped. The first one is the survival of firms whose business model cannot cover the normal cost of capital. The OECD estimated in 2021 that “zombie” firms reached ≈12% of listed companies in advanced economies — a record level, traceable to a real cost of capital that no longer played its filtering role.

The second is the rerouting of credit toward existing assets rather than productive investment. According to the BIS Annual Report 2024, credit flows in advanced economies during the negative-rate period concentrated in real estate and share buybacks, not industrial capex. Eurozone residential prices rose ≈35% between 2015 and 2022 (Eurostat), absorbing a growing share of available financing. The shift in capital allocation under prolonged negative rates is exactly the mechanism behind the perverse effects of negative real rates on the productive base.

The channel erodes the channel

The third effect is the one that most directly breaks the linear model: persistent low rates compress the very intermediation margin that is supposed to deliver credit. Eurozone bank net interest margins dropped to ≈1.1% in 2020, from ≈1.6% in 2010 (ECB data). Thinner margins mean less capacity to absorb non-performing loan losses, which pushes banks to ration credit to riskier borrowers — the same borrowers that low rates were supposed to bring back to the financing table.

The ECB documented this self-defeating dynamic in its Working Paper output (2023) under the term “reversal interest rate” — the threshold beyond which further easing actively tightens credit conditions instead of loosening them. It remains one of the clearer pieces of evidence that the relationship between rates and credit is not monotonic.

What this implies for the current regime

The return to mildly positive real rates in early 2026 is not, on this reading, a brake on growth. It is a return to filtering. Restoring a profitability test on investment, rebuilding bank margins and pruning the unviable end of the productive base are improvements that take time to register in GDP and look painful in the short run. The variable that matters is not the level of rates at a given moment but the duration over which a regime persists — and the volume of distortions that regime has time to accumulate inside the financial conditions that feed those distortions.

Last updated — 18 May 2026