Mechanism of issue and circulation of currency paper currency instead of the precious metal has been a decisive moment in the evolution of currency and monetary systems, helping her with a commodity currency to the practical realization of monetary functions. However, to impose its circulation was necessary to keep in touch over the metal as a monetary standard. The use of paper currency was backed by a mechanism for convertibility, receiving the equivalent in gold-currency demand for the currency paper and show the public trust for the monetary mechanism. Gradually, the operation of monetary systems is accompanied by certain contradictions between the amount of metal needed money from the reserve bank and demanded money from commercial transactions in ascending.