After a two-month transition period in which euro coins and notes circulated alongside francs, marks, lira, and other legacy currencies, twelve European Union countries retired their old money for good, completing the largest currency changeover in history. It marked the practical culmination of a monetary union first agreed upon in the Maastricht Treaty nearly a decade earlier.
The changeover was a logistical feat almost without precedent: roughly 15 billion banknotes and 50 billion coins had to be printed, minted, distributed, and swapped into circulation across a dozen countries within weeks, while an equivalent mass of legacy currency had to be collected and destroyed. Armored trucks moved cash across borders under heavy security for months beforehand, and banks ran round-the-clock operations to keep ATMs stocked with the unfamiliar new bills.
Psychologically, the transition was just as significant as the logistics. For older Europeans especially, retiring currencies like the German mark or Italian lira meant surrendering a piece of national identity that had outlasted wars, occupations, and the collapse of empires. Some countries, like Germany, allowed indefinite exchange of old notes at central banks, an acknowledgment of the emotional weight attached to money.
The euro's introduction reshaped daily commerce and travel across the continent, eliminating currency-exchange friction for hundreds of millions of people and creating a genuinely shared economic identity. It also planted the seeds of later strain: a single currency meant countries as different as Germany and Greece would share one monetary policy, a tension that erupted violently during the eurozone debt crisis less than a decade later.