Which was the effect of the stock market crash in the 1920s

The Great Depression was a huge effect of the stock market crash.

During the 1920s, the U. S. stock market underwent rapid expansion, reaching its peak in August 1929, after a period of wild speculation. 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 eventual market collapse were low wages, the proliferation of debt, a struggling agricultural sector and an excess of large bank loans that could not be liquidated.