Four of Europe's largest economies published October inflation numbers on the same Friday, and they barely look like they belong to the same currency union. Italy: 5.4%. Spain: 4.9%. France: 3.4%. Germany: 2.8%.

All four are facing the same surge in energy costs. The spread between them is the story, and it matters more for the European Central Bank than any single headline.

Italy takes the worst of it

According to national statistics office Istat, Italian inflation jumped to 5.4% in October from 4.2% in September, well above the 4.6% economists expected, as reported by Euronews. That is the highest reading since August 2023.

Energy did most of the damage. Istat put energy prices 31.4% higher than a year earlier, up from 22.6% a month before. Regulated energy tariffs, the ones not set freely by the market, were up 59.5%. Food is catching up too: unprocessed food prices accelerated to 7.5%, and core inflation, which strips out energy and fresh food, rose to 2.0% from 1.6%.

The timing makes it worse. Istat also reported that the Italian economy did not grow in the third quarter, so households are absorbing higher bills with no income cushion. On the same day, thousands joined a general strike in Italy over living costs and defence spending, according to Euronews video coverage.

France in the stagflation zone

France's rate rose to 3.4% from 3.1%, its highest since January 2024, according to statistics office Insee, and above the 3.2% economists had forecast. Energy prices were up 24.1% year on year, accelerating for a fourth month running.

At the same time, the French economy shrank 0.1% in the third quarter. Claus Vistesen, chief eurozone economist at Pantheon Macroeconomics, put it flatly: France faces stagflation, meaning rising prices on top of a stalled economy. He expects French inflation on the EU's harmonised measure, which was 3.8% in October, to climb above 4% by November.

Spain is the outlier on the growth side. Its inflation held at 4.9%, but output grew 0.6% in the third quarter, supported by stronger domestic demand, according to MHA economist Joe Nellis. High prices are a smaller threat when the economy is expanding.

Germany's drop is mostly a tax story

Germany is the number that will draw the most attention, and the headline drop deserves the least trust. Destatis reported inflation falling to 2.8% from 3.3%, below the 3% forecast. The main reason was a fuel tax cut that took effect on Oct. 1 and runs only until the end of the year. Energy inflation eased to 12.2% from 14.9%, and consumer prices fell 0.2% from September.

An administrative fix, then, not a market one. Vistesen warned that energy inflation is likely to snap back in January and February if fuel duties rise again, and he said the soft German core numbers look dovish but will not last. Core inflation did ease to 2.1% from 2.4%. Since core excludes energy, the fuel tax cut does not explain that part, so it is the one German figure worth watching.

My read: treat Germany as a policy experiment with an expiry date. It shows that a targeted tax cut can shave roughly half a point off headline inflation in a month. It does not show that the underlying pressure has gone.

What it means for the ECB

The data arrived one day after the ECB held its deposit rate at 2.5% following a hike in September. According to Euronews, Christine Lagarde said policymakers discussed another increase but agreed unanimously to wait, and she also announced she will step down in February. Blogerroom covered that decision alongside the Fed, Bank of Japan and Bank of Canada in our central bank roundup.

Now the arithmetic looks tougher. Before the Italian figures, BofA Global Research expected October eurozone inflation of 3.7%. Afterwards, Pantheon raised its forecast to 4.0%, up from 3.8% in September and twice the ECB's 2% target. Eurostat publishes the official flash estimate on Nov. 4, and September's reading was 3.8%, according to Eurostat, with energy inflation at 18.8%.

Paolo Grignani of Oxford Economics described the day's data as stagflationary, pointing to the energy shock spreading to stickier prices. With eurozone growth at just 0.4% in the third quarter, Oxford expects the ECB to raise rates twice more.

The split that decides December

A single policy rate now sits over economies pulling in different directions. Spain can absorb a hike. France, shrinking and with inflation heading above 4%, would feel it badly. Italy has flat growth and the hottest prices of the four.

The ECB's problem is that it cannot hike for Italy's inflation without punishing France's economy, and it cannot hold for France's economy without letting Italy's food and energy bills harden into wage demands. Germany's temporary relief will not settle that argument. The Nov. 4 flash estimate and the December meeting will show which of these four stories the rest of the bloc is following.