ECB chief economist flags inflation risks as European defence spending surges to €418 billion

Europe is spending on defence like it hasn’t in decades, and the European Central Bank is starting to talk openly about what that means for inflation, debt, and monetary policy. ECB Chief Economist Philip R. Lane joined a panel at the European Economic Association’s annual congress in Dublin on August 17, laying out the macroeconomic consequences of a continent that’s rapidly rearming.

The numbers tell a clear story. Defence spending across the 27 EU member states hit €418 billion in 2025, a 20% jump from 2024 and nearly double the €218 billion spent in 2021. That kind of fiscal acceleration doesn’t happen quietly.

The GDP boost comes with strings attached

Lane’s panel, organized by the European Stability Mechanism and titled “Europe’s Defence Build-Up: Macroeconomic, Fiscal, and Financial Stability Challenges,” zeroed in on a tension that economists love and policymakers dread. More government spending can juice economic output in the short term, with defence spending multipliers estimated at roughly 1. That means every euro spent on defence generates about one euro of GDP.

Historical analysis presented at the panel suggests that defence build-up episodes tend to widen fiscal deficits by an average of 2.6 percentage points of GDP. Within three years of a sustained defence ramp-up, debt-to-GDP ratios have historically climbed by around 7 percentage points.

For an economic bloc where GDP growth projections sit at a modest 0.8%, that’s a meaningful deterioration in fiscal health.

The panel explored how the composition of defence spending matters enormously. Money directed toward research and development, for instance, tends to have different long-run productivity effects compared to current expenditure on personnel and operations.

The inflation question the ECB can’t ignore

Lane and his fellow panellists also wrestled with the inflation implications. When governments inject hundreds of billions of euros into the economy through defence procurement, that demand competes for workers, materials, and industrial capacity with the private sector.

How the spending gets financed is arguably the most consequential variable. Deficit-financed defence spending creates one set of macroeconomic dynamics. Tax-financed spending creates another. Joint European borrowing, like the kind floated in various EU-level defence proposals, introduces yet another channel with its own implications for bond markets and sovereign spreads.

If a significant portion of defence procurement flows to non-European suppliers, the spending boost to domestic GDP gets diluted while the fiscal cost remains the same.

Fiscal-monetary coordination under pressure

The ECB sets monetary policy for 20 countries, each with its own fiscal position, defence ambitions, and borrowing capacity. Germany’s fiscal room to expand defence spending looks very different from Italy’s or Greece’s.

The speed of the spending increase compounds the challenge. Going from €218 billion in 2021 to €418 billion in 2025, essentially doubling in four years, means supply chains, labor markets, and government budgeting processes are all absorbing the shock simultaneously.

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