The euro entered the world on 1 January 1999 as an accounting currency, with euro notes and coins following three years later on 1 January 2002. Twenty-seven years after its launch, the single currency is used by 20 of the EU’s 27 member states, covers an economy of roughly 350 million people, and is the world’s second most traded currency after the US dollar. It has survived crises that at various points looked potentially fatal. It has not delivered all of the convergence, stability and prosperity that its architects promised. An honest assessment of where it stands in 2026 requires acknowledging both.
What the euro has achieved
The single currency’s most straightforward achievements are the ones least visible in daily life precisely because they worked. Exchange rate volatility within the eurozone — which in the 1990s imposed real costs on businesses trading across borders and travellers moving between countries — was eliminated entirely. The interest rate convergence that accompanied eurozone membership reduced borrowing costs dramatically for countries that had previously paid significant risk premiums: Italian, Spanish, Portuguese and Greek sovereign borrowers all saw their rates converge toward German levels in the years following EMU entry, reducing debt servicing costs and enabling investment. The euro gave European businesses a large common currency market that eliminated hedging costs and simplified financial planning across borders.
The euro has also proven more durable than its critics predicted. During the sovereign debt crisis of 2010–2015, serious analysts were producing serious arguments that the eurozone would fragment — that Greece would exit, that contagion would spread, that the currency union would not survive the stress it was under. It did survive, at significant cost to the adjustment countries, through a combination of ECB commitment (“whatever it takes”), fiscal adjustment, and structural reforms that were economically painful but preserved monetary union. The episode tested the euro and the institutional architecture around it; the response built institutions — the European Stability Mechanism, banking union, ECB bond-buying programmes — that did not exist before and that have strengthened the currency’s resilience since.
Where the euro has underdelivered
The honest accounting of underdelivery is equally real. The convergence hypothesis — that monetary union would drive economic convergence between member states as capital and labour moved freely toward their most productive uses — has not been fulfilled in the way the original architects predicted. Productivity and income gaps between northern and southern eurozone members narrowed in the 2000s and then widened again after the crisis. The asymmetric shock problem — the fact that a single interest rate cannot be optimal for all 20 diverse economies simultaneously — has not been resolved; it has been managed. The incomplete nature of eurozone governance, which has monetary union without full fiscal union, creates persistent fragility that each crisis exposes afresh.
The ECB’s tightening cycle of 2022–2024, as covered in our analysis of the ECB’s 2026 rate decisions, was the steepest in the euro’s history and hit eurozone economies with very different mortgage structures, debt levels and growth profiles very differently. Uniform monetary policy in a diverse economic union will always produce winners and losers; the question is whether the political architecture can manage those distributional effects sustainably.
Who’s next — and what the future looks like
Several EU member states outside the eurozone are at various stages of the convergence process. Bulgaria has been in the ERM II exchange rate mechanism — the formal waiting room for euro adoption — since 2020 and has a euro adoption target, though meeting all criteria has proven more challenging than initially expected. Romania and Hungary remain outside ERM II. Sweden, which rejected the euro in a 2003 referendum, has shown no political movement toward adoption despite meeting the economic criteria. Poland’s euro debate remains politically dormant under successive governments that have found no electoral advantage in reviving it.
At 27, the euro is a mature institution — past its existential crisis years, embedded in the financial architecture of the world economy, but still incomplete in the fiscal and political sense that its architects knew it was when they launched it. The project they began in 1999 had a logic that pointed toward deeper fiscal integration; reaching that destination has proven considerably harder than the currency’s founders allowed themselves to say publicly. The euro’s next decade will be defined by whether Europe finds the political will to complete the architecture, or continues managing the incomplete version — which, so far, has proven more survivable than its critics expected.
