In the third paper in CEPR's Europe 2050 series, Enrico Letta, author of the 2024 report on the Single Market that helped set the EU's current competitiveness agenda, turns from diagnosis to delivery. Writing as one of the architects of the One Europe, One Market Roadmap adopted by the European Parliament, Council and Commission in April 2026, he traces how a shared analysis of Europe's fragmentation was translated into a concrete institutional commitment: more than forty legislative