The Great Depression Splits Economists Over What a Currency Crisis Really Is
A stock market crash becomes a decade-long global depression, and economists still disagree on exactly why
Quick facts
- Crash
- October 1929
- Duration of Depression
- c. 1929-1939
- Monetarist explanation
- Fed failure to offset banking panics (Friedman/Schwartz)
- Alternative explanations
- Collapsed investment (Keynesian); gold standard orthodoxy (NBER research)
What happened
The U.S. stock market crashed in October 1929, and the downturn spread into a global economic crisis compounded, according to the U.S. State Department's Office of the Historian, by a German economic slump and financial difficulties in France and Great Britain that together produced a genuine global financial crisis. The gold standard, which had been reinstated in various forms after the First World War, introduced what the State Department's account calls inflexibility into domestic and international financial markets, since countries could not freely expand their money supply without risking their fixed gold convertibility. Economists have never fully agreed on why a stock crash turned into a decade-long depression. Monetarists, following Milton Friedman and Anna Schwartz, argue the Federal Reserve's failure to expand the money supply and stop bank panics turned a normal recession into a catastrophe; Keynesian explanations instead emphasize a collapse in investment and aggregate spending; and later research by economists including at the NBER has argued that adherence to gold-standard orthodoxy itself, not merely a monetary policy mistake, was what transmitted and deepened the crisis across countries.
Why it matters
The Depression forced a rethinking of the gold standard's costs, pushed the United States off gold internally in 1933 to 1934, and set the stage for the Bretton Woods system negotiated at the end of the Second World War; the unresolved debate over its causes, monetary failure versus collapsed investment versus the gold standard's rigidity, still shapes how economists think about every financial crisis that has followed, including 2008.
How we know
Stock price data, Federal Reserve records, and international trade and gold-flow statistics from the period are well preserved, and decades of subsequent economic research, including Friedman and Schwartz's landmark 1963 monetary history and later NBER studies decomposing the shocks involved, have analyzed this same data and reached different conclusions about causation.
Sources
- U.S. Department of State, Office of the Historian. The Great Depression · Reputable sourcehistory.state.gov · The domain "history.state.gov" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- National Bureau of Economic Research, The NBER Reporter. Monetary Policy Regimes, the Gold Standard, and the Great Depression · Unclassified sourcenber.org · Cited as a "academic" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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Related timelines
- The Great Depression → · See the Great Depression timeline for the fuller political, social, and international history of the crisis this event summarizes from a monetary angle.