Human Action is a monumental work by Austrian economist Ludwig von Mises, first published in 1949. The book presents Mises’ systematic exposition of economics, grounded in the praxeological method, which analyzes human action as purposive behavior. Mises argues that economic theory must be rooted in this method, which allows us to derive the basic principles of economics from the fact of human action. He then proceeds to expound on a variety of topics, including the theory of prices, money, banking, business cycles, and interventionism. Throughout the book, Mises emphasizes the importance of the market economy and individual freedom and warns against the dangers of government intervention and socialism. Human Action is widely regarded as one of the most influential works in the history of economics and a cornerstone of the Austrian School of Economics.