The lessons of interaction of commodity money (gold) and credit money (pound sterling and dollar) are considered using the case of Peel’s Act of 1844 in Great Britain and the case of Bretton Woods monetary system. The ideas of “Triffin’s dilemma”, and its significance are discussed, as well, as its negative influence on the people’s understanding of the monetary system construction. The erroneous of common world currency is discovered. The trend of national currency ascent to the status of world currency is determined as a typical way of currency development and currency competition.