This book offers an examination of the empirical data of business cycles, the theories that economists have developed to explain them, and major case studies of recessions and depressions both in the United States and internationally. When it first appeared in 2004, the first edition of Recessions and Depressions: Understanding Business Cycles offered readers an expertly guided tour through fundamental business cycle theories and the latest research on pivotal market failures. In the aftermath of the events of the 2008 economic crisis, Knoop offers an extensively updated new edition. As before, the second edition offers clear explanations of classical and Keynesian economic theory and how each has moved in and out of favor from the early 20th century to the present. It then provides detailed studies of major business-cycle downturns in the United States, from the Great Depression and postwar recessions to the new economy of the 1990s, the 2001 recession, and in an all-new chapter, the 2008 global financial crisis. The book also features an exhaustive update of statistical data, plus coverage of recent international crises in Argentina and Japan, and a new chapter on what we do and don't know about business cycles.