The European Monetary System, abbreviated as EMS, was an exchange rate regime set up in 1979 (and which ended in 1999) to foster closer monetary policy co-operation between the central banks of the Member States of the European Economic Community (EEC). The objective of the EMS was to promote monetary stability in Europe. The European Monetary System was built on the concept of stable but adjustable exchange rates defined according to the newly created European currency unit (ECU) – a currency basket based on a weighted average of EMS currencies. Within the EMS, currency fluctuations were controlled through the Exchange Rate Mechanism (ERM).