Economics & Finance / Macroeconomics / International Trade & Globalization

EU Expansion: Why Free Trade Saved Western Europe from a Migration Disaster

Lorenzo Caliendo, Luca David Opromolla, Fernando Parro, Alessandro Sforza

In 2004, the European Union underwent its largest expansion, integrating both goods and labor markets across East and West. Everyone feared a massive wave of Eastern European immigrants flooding Western Europe. But something unexpected happened: the migration was surprisingly small. Why? This video breaks down a 2017 study by economists Lorenzo Caliendo, Luca David Opromolla, Fernando Parro, and Alessandro Sforza, who built a dynamic model to quantify the effects of this historic event. They reveal a counterintuitive truth: free trade acted as a pressure valve, reducing the need for migration by boosting wages in Eastern Europe. Without it, Western Europe would have faced a welfare loss. We'll explore how trade and migration policies interact, who really won—spoiler: Eastern low-skilled workers gained the most—and how the UK's early open-door policy backfired due to public service crowding. Packed with data on welfare gains, migration flows, and policy lessons, this is the economics of integration you didn't learn in school.