The article examines the economic impacts of the euro on the three largest economies in the European Monetary Union (EMU) and its position in the global economy compared to the dollar. It discusses how the euro's introduction has influenced global politics and economics. The study analyzes the efficiency of the euro in creating an optimal currency area and highlights the risks associated with the euro, especially in light of events like Brexit. The research emphasizes the importance of monetary unification for political unification within the EU.