A currency in the most specific use of the word refers to money in any form when in actual use or circulation as a medium of exchange, especially circulating banknotes and coins. A more general definition is that a currency is a system of money (monetary units) in common use, especially in a nation. Under this definition, US dollars, British pounds, Australian dollars, and European euros are examples of currency and they are very expensive currencies in the world. These various currencies are recognized stores of value and are traded between nations in foreign exchange markets, which determine the relative values of the different currencies. Currencies in this sense are defined by governments, and each type has limited boundaries of acceptance. The most expensive currency of 2016 is the Euro or the British pound instead of the U.S Dollar. The currencies are the most valuable in the world which belongs to the economies that are the wealthiest. The currencies are listed with the U.S Dollar which runs for the money for the most expensive currency in the world. Check out the important facts in detail about the most wealthiest currencies around the globe through this app.