The 1920s and the 1990s in Mutual Reflection

Abstract

This paper develops a new analysis of the U. S. economy in the 1920s that is illuminated by contrasts with the 1990s, and it also re-examines the causes of the Great Depression. In both the 1920s and the 1990s the acceleration of productivity growth linked to the delayed effects of previously invented "general purpose technologies" stimulated an increase in fixed investment that became excessive and proved to be unsustainable, while the productivity acceleration helps to account for low inflation in both decades. The uncanny parallel of the stock market boom, bubble, and collapse in 1995-2001 as in 1924-1930, reminds us that business cycles emerge from the complex interplay of multiple factors, not just one.