The euro area's aggregate HICP of 2.3% in November 2026 suggests the ECB is close to its 2% target. But that number conceals a striking range: from −0.3% deflation in Finland to +4.1% in Croatia. The fact that multiple northern European member states are already experiencing falling prices raises a question that is easy to dismiss but dangerous to ignore: could the ECB, focused on the aggregate, cut rates too slowly for the deflation-prone members?

What is driving deflation in Finland and the Netherlands

Both countries are unusually exposed to energy price movements. Finland imports a large share of its natural gas (now from LNG terminals and pipelines replacing Russian supply), and Dutch households were among the most exposed to the gas price spike of 2021–22. As European natural gas spot prices normalised — TTF fell from over €300/MWh in August 2022 to under €40/MWh by late 2026 — the year-on-year energy base effect turned sharply negative. This created a mechanical deflationary impulse in energy-heavy CPI baskets.

For both countries, the deflation is almost entirely energy-driven. Excluding energy, Finnish and Dutch core inflation remains slightly positive (~0.5–1.0%). This is the key mitigating factor: when the energy base effect normalises in early 2027 (when comparisons are against already-low late 2026 prices), headline inflation should return toward zero or slightly positive. True deflation — generalised, broad-based, self-reinforcing — requires not just energy prices falling, but wages, services prices, and expectations also declining. That has not happened in either country.

The monetary union problem

What makes this dynamic particularly notable is the monetary union context. In a flexible exchange rate system, Finland could theoretically allow its exchange rate to depreciate relative to Croatia — giving its economy a competitiveness boost and reflating prices. In the euro area, no such adjustment is possible. The ECB sets one interest rate for the entire zone. When some members face deflation risk and others face above-target inflation, the ECB's single policy rate is simultaneously too tight for some and too loose for others.

This structural tension — the same one that characterised the 2010–14 euro crisis — means the ECB must monitor the cross-member distribution of inflation, not just the aggregate. If deflation spreads from Finland and Netherlands to Germany (HICP at 1.6% in November 2026), the ECB's calculus changes significantly. See our euro area divergence analysis for the full country-by-country picture, and our inflation expectations term for why persistent deflation in anchored expectations is the real risk.