On 1 January 2023, Croatia became the newest member of the Schengen Agreement of the European Union (EU) and also joined the Eurozone. This will not only mean a new currency and the elimination of border controls. It will also mean reductions in barriers to trade between Croatia and other EU member states. The Schengen Agreement and the Eurozone are part of the engine of European integration, namely the reduction of trading costs between the member countries in various dimensions as well as in trade with third countries. This includes the European Customs Union, the European Single Market, the Eurozone, the removal of customs barriers in the Schengen area and the EU’s free trade agreements with third countries.