Hyperinflation is a chaotic period of economic upheaval when the monthly rate of inflation exceeds 50 percent. This leads to some extremely high denomination banknotes in circulation. Included in this set is a Turkish 1 million lira, an Argentinian 1 million pesos, a Croatian 50 billion dinara, a Weimar 50 million mark, a Yugoslavian 500 billion dinara, a Zimbabwe 1 billion dollar note and a Hungarian 1 billion milpengo. This set comes with a Certificate of Authenticity and billfold.