The Great Depression was caused by many different reasons. The first reason is that there were high demands for consumer goods and agricultural products, and that led to overpopulation. The second reason was that buying on credit increased personal debt. Another cause of the Great Depression was that buying on a margin was a risky market practice--Bank loands for stock purchases was an unsound practice. (Not valid). Finally, The Smoot-Hawley Tarriff created trade war worsened world economic conditions. Huge increases in taxes hurt companies and individuals.
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