What caused the stock market to crash on October 24, 1929?

 there were low wages, the proliferation of debt, a struggling agricultural sector and an excess of large bank loans that could not be liquidated.

Explanation:

By then, production had already declined and unemployment had risen, leaving stocks in great excess of their real value. Among the other causes of the stock market crash of 1929 were low wages, the proliferation of debt, a struggling agricultural sector and an excess of large bank loans that could not be liquidated.

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