Few periods in history compare to the Great Depression. Stock market crashes, bread lines, bank runs, and wild currency speculation were worldwide phenomena--all occurring with war looming in the background. This period has provided economists with a marvelous laboratory for studying the links...

I construct an index of sectoral dynamics to characterize changes in the sectoral composition of economic activity. There is evidence of asymmetry in different phases of business cycles with recessions being associated with larger changes in sectoral composition than expansions. I find that the...