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The eurozone, officially euro area, refers to a currency union among the European Union member states that have adopted the euro as their sole official currency. The Eurosystem, headed by the European Central Bank, is responsible for monetary policy within the Eurozone.

The Eurozone has 19 members, with a further six states and territories using it as their sole currency. It circulates widely beyond that, and has started to serve as a reserve currency. Based on official estimates of 2007 GDP, the Eurozone is the largest economy in the world.