Europe has a well-developed financial sector. Many European cities are financial centres with London being the largest. The financial sector of the Eurozone is helped by the introduction of the euro as common currency. This has made it easier for European households and firms to invest in companies and deposit money in banks in other European countries. Exchange rate fluctuations are now non-existent in the Eurozone. The financial sector in Central and Eastern Europe is helped by economic growth in the region, European Regional Development Fund and the commitment of Central and Eastern European governments to achieve high standards.