The three treatises in On the Manipulation of Money and Credit were written in German between 1923 and 1931. Together they include some of Mises's most important contributions to monetary and trade-cycle theories and constitute a precursor to Mises's major work, Human Action. In the first essay, «Stabilization of the Monetary Unit from the Viewpoint of Theory," written during the period of German hyperinflation, Mises discusses the consequences of the fluctuating purchasing power of paper money. He explores such ideas as the outcome of inflation, that is, the result of the increase in the amount of money, and an emancipation of monetary value from the influence of government.The second essay, «Monetary Stabilization and Cyclical Policy," written in 1928, presents Mises's business-cycle theory. Published on the eve of the Great Depression, the treatise critiques schemes for stabilizing prices and for “measuring” purchasing power.The third piece, «The Causes of the Economic Crisis,” is a speech Mises delivered in 1931 exploring the nature and role of the market and cyclical changes in business conditions. He assesses the causes and effects of the crisis of the time and discusses various potential solutions to the problems of the Depression.Ludwig von Mises (1881–1973) was the leading spokesman of the Austrian School of economics throughout most of the twentieth century. He earned his doctorate in law and economics from the University of Vienna in 1906. In 1926, Mises founded the Austrian Institute for Business Cycle Research. From 1909 to 1934, he was an economist for the Vienna Chamber of Commerce. Before the Anschluss, in 1934 Mises left for Geneva, where he was a professor at the Graduate Institute of International Studies until 1940, when he emigrated to New York City. From 1948 to 1969, he was a visiting professor at New York University.Bettina Bien Greaves is a former resident scholar, trustee, and longtime staff member of the Foundation for Economic Education. She has written and lectured extensively on topics of free market economics. Her articles have appeared in such journals as Human Events, Reason, and The Freeman: Ideas on Liberty. A student of Mises, Greaves has become an expert on his work in particular and that of the Austrian School of economics in general. She has translated several Mises monographs, compiled an annotated bibliography of his work, and edited collections of papers by Mises and other members of the Austrian School.