What do the Monetarist and Keynesian economists claim was the main cause of the Great Depression?

Question

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Both Monetarist and Keynesian economists agree that the main cause of the Great Depression was a downturn in demand. Monetarist economists believe that the contraction of the money supply by the Federal Reserve contributed significantly to the downturn in demand, while Keynesian economists argue that a lack of government intervention and spending also played a role.

What Do the Monetarist and Keynesian Economists Claim Was the Main