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
Shall and will futurity. In practice, however, this rule is often not observed – the two auxiliaries are used interchangeably, with "will" being far more common than "shall". This is discussed in more detail in the following sections. According to "Merriam Webster's Dictionary of English Usage", the distinction between "shall" and "will" as future markers arose from the practice of Latin teaching in English schools in the 14th century. It was customary to use "will" to translate the Latin "velle" (meaning to wish, want or intend); this left "shall" (which had no other equivalent in Latin) to translate the Latin future tense. This