On July 4th, the gold content of 1948 Cruzeiro was 0.0480363g, and the legal exchange rate of 18.50 Cruzeiro was equal to 1 USD. From 1946 to 1952, Brazil adopted a single import exchange rate system, and the export exchange rate was 18.38 Cr? O and import exchange rate 18.72 USD. After the legalization of Brazil's free market in June 1953+ 10, Brazil began to implement free market settlement in June 1958+ 10, and the export foreign exchange income was sold in the market by auction. 1961March 14 will also be transferred to the government-controlled free market. In the early 1980s, due to the serious debt crisis in Brazil, Cruzeiro continued to depreciate and the economic situation was very grim. In order to curb high inflation and stabilize the economy, Brazilian President Saarna issued the Cruzado Plan in February 18 and 1986, and in June 1987, Brazil implemented the New Cruzado Plan, stipulating that from 1988, the central bank will become an independent institution, be under the jurisdiction of the Ministry of Finance, and at the same time implement the Cruzado depreciation policy. From 1990 to 16 in March, Brazil's currency name was restored to Cruzeiro, and a flexible exchange rate policy was implemented. Cruzeiro floats independently in the inter-bank foreign exchange market according to the US dollar. By 199 1 year1February 3 1 day, Cruzeiro's buying and selling exchange rates were 1068.70 and 1068.80 USD respectively.