The euro is the sole currency of 16 EU member states:
With all but two of the remaining EU members obliged to join, together with future members of the EU, the enlargement of the eurozone is set to continue further. Outside the EU, the euro is also the sole currency of two former Yugoslavian states (
It is also gaining increasing international usage as a trading currency, in
The possibility of the euro's becoming the first international reserve currency is now widely debated among economists. Former Federal Chairman Alan Greenspan gave his opinion in September 2007 that the euro could indeed replace the U.S. dollar as the world's primary reserve currency. He said it is "absolutely conceivable that the euro will replace the dollar as reserve currency, or will be traded as an equally important reserve currency."