Currency relative values of the different currencies. Currencies in this sense are defined by governments, and each type has limited boundaries of acceptance. Other definitions of the term "currency" are discussed in their respective synonymous articles banknote, coin, and money. The latter definition, pertaining to the currency systems of nations, is the topic of this article. Currencies can be classified into two monetary systems: fiat money and commodity money, depending on what guarantees the value (the economy at large vs. the government's physical metal reserves). Some currencies are legal tender in certain political jurisdictions. Others are simply traded for their economic
Cash (currency) n.1. From an early date the Portuguese applied "caixa" (probably on the same analogy) to the small money of other foreign nations, such as that of Maritime Southeast Asia, and especially the Chinese, which was also naturally made into cash in English. (Yule)" The English word "cash," meaning "tangible currency," is an older word from Middle French "caisse". In China, "cash" - not to be confused with the type of copper coin - refers to a unit used for centuries for copper coinage and banknote equivalents known as "wén" (文). Being the first country to implement paper based currency, in