European Currency Unit opportunity for foreign diversification without reliance on the currency of a single country. The ECU was conceived on 13 March 1979 as an internal accounting unit. It had the ISO 4217 currency code XEU. On 1 January 1999, the euro (with the code EUR and symbol €) replaced the ECU, at the value €1 = 1 ECU. Unlike the ECU, the euro is a real currency, although not all member states participate (for details on euro membership see Eurozone). Two of the countries in the ECU basket of currencies, UK and Denmark, did not join the eurozone, and a third,
International status and usage of the euro standing, mostly at the expense of the dollar. The increase of 4.4% in 2002 is due to the introduction of euro banknotes and coins in January 2002. The possibility of the euro's becoming the first international reserve currency is now widely debated among economists. Former Federal Reserve Chairman Alan Greenspan gave his opinion in September 2007 that the euro could indeed replace the US 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." In the second