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The causes of the Great Depression are a matter of active debate among economists, and are part of the larger debate about economic crises, although the popular belief is that the Great Depression was caused by the crash of the stock market.
Economic historians usually attribute the start of the Great Depression to the sudden devastating collapse of US stock market prices on October 29, 1929, known as Black Tuesday; some dispute this conclusion, and see the stock crash as a symptom, rather than a cause, of the Great Depression.