During the 1920s, what did installment buying, income inequality, and stock market speculation help contribute to?

Speculation And Overleverage In The Great Depression

Rampant speculation led to falsely high stock prices, and when the stock market began to tumble in the months leading up to the October 1929 crash, speculative investors couldn't make their margin calls, and a massive sell-off began.

Explanation:

Stock Speculation

Before the Great Depression, there were limited regulations that governed the stock market. Investors were able to speculate wildly and buy stocks on margin or using borrowed money. ... The poor policies that governed the stock market proved to be another of the causes of the Great Depression

d. it adversely affected american productivity

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