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Why do the largest market fluctuations occur in September, October and November?

Abbreviated Question: 
Why do the largest market fluctuations occur in September, October and November?
Answer: 

At present, I am not aware of a widely accepted academic research in economics and finance that would provide a definitive explanation for the exact calendar timing of major financial market fluctuations in the United States for the time period following the establishment of the Federal Reserve System in 1913. (Periodic financial crises prior to the establishment of the Fed in 1913 are typically attributed to the crop cycle---please see the link to a NYT article below.)