Plato - The IFI Question?
"The citizen of the ideal state will require a currency for the purpose of every day expenses; This is practically indispensable for workers of all kinds and for such purposes as the payment of wages to wage earners. To meet these requirements, the citizen will possess a currency which will pass for value among themselves, but will not be accepted outside their own boundaries. But a stock of some currency common to the Hellenic world generally i.e., of international currency, will at all times be kept by the state for military expenditures or official missions abroad such as embassies and for any other necessary purposes of state. If a private citizen has occasion to go abroad, he will make his application to the government and go; and upon his return if he has any foreign currency left over in his possession, he will hand it over to the state receiving in exchange the equivalent in local currency." Plato