Prof. Bryan Caplan
bcaplan@gmu.edu
http://www3.gmu.edu/departments/economics/bcaplan
Econ 311
Fall, 1999
Week 13: The Macroeconomics of Laissez-Faire and Interventionism: The Great Depression and European Unemployment
- The AD Puzzle and the AS Puzzle
- From 1929 until World War II, most of the world suffered extraordinary economic problems. These were at their most severe in the U.S.
- Unemployment reaches about 25%.
- Real output falls even more.
- The price level falls by about 1/3.
- Real wages RISE by about 25%.
- In the U.S., the downturn began in 1929, and got much worse from 1931-1933. The economy slowly recovered over the next 8 years. (Interrupted by a further downturn in 1937-8).
- What happened during the GD? This question needs to be decomposed into two questions:
- The AD Puzzle: What caused the sharp negative shocks to AD?
- The AS Puzzle: Why did the AD shocks matter so much, and for so long? After all, isn't AS only supposed to matter in the short-run?
- Solving the AD Puzzle: Monetary Contraction
- It took economists a long time to figure this out, but the AD is easily answered: there was a huge worldwide contraction in the (broadly measured!) money supply. In the U.S., M2 fell by about 1/3 from 1929 to 1933. It fell again in 1937-8. The same happened all over the world.