The 2004 EU Enlargement Was a Success Story Built on Deep Reform Efforts

Poland is one of the success stories of European economic convergence. The country, which in January takes the reins of the Council of the European Union (the decision-making institution representing the Union’s member states) is now the EU’s sixth largest economy. This convergence process was driven by the 2004 EU enlargement, which also welcomed the Czech Republic, Cyprus, Estonia, Hungary, Latvia, Lithuania, Malta, Slovenia, and Slovakia into the Union, expanding the EU’s population by about 20 percent.  

Twenty years later, as new EU accession discussions are underway, it is worth looking at how much the earlier enlargement benefitted new members and the whole Union, and reflect on the economic returns of broadening the European single market. The current accession candidates, in different stages of the process, are Albania, Bosnia and Herzegovina, Kosovo, Montenegro, North Macedonia, Serbia, Georgia, the Republic of Moldova, Ukraine and Türkiye. In October, the European Commission issued a new report with detailed assessments of the state of play and the progress toward EU accession made by each candidate.

A new note by the Regional Economic Outlook for Europe shows that the 2004 EU enlargement brought substantial income gains. These gains were particularly large in the new member states: after 15 years GDP per person was on average more than 30 percent higher than it would have been without EU accession.

The factors driving these gains in new members were threefold. First, the 2004 group benefitted from more comprehensive economic reforms prior to joining the EU than implemented in comparable other regions, including on trade, financial sector, and product market liberalization. Second, additional financing from foreign direct investment and EU cohesion funds helped boost the capital stock. Third, technology transfers and enhancements in educational attainment improved productivity.