Milton Friedman, during his long and distinguished career, made significant contributions to economic analysis, including methods, key areas of money, consumption, economic policy, the inflation rate and the unemployment rate, and the exchange rate policy debate. In his essays on positive economics, Friedman used the field of experimental economics instead of assuming it as a powerful argument. In fact, what he calls "if the hypothesis is crucial for understanding the breadth of his empirical work, particularly in the monetary domain". An empirical study of the first major Freedman was conducted at the University of Chicago and the National Bureau of Economic Research. United States Monetary and Banking Workers. To this end, in three main publications: Monetary History of the United States, 1867-1960, Anna J. Schwartz, with the change in the volume of money, decided to store the factors and effects of 1875-1960; currency, and co-author with Schwartz Friedman LED mourning money from his competent Chicago school for his later work. When he attacked, many economists ignored the analysis of money and business monetary policy....