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September's Historical Impact on Stock Market Performance

Despite being the only month with an average negative return, long-term trends suggest resilience in the market.

  • September is the worst month for stocks, with an average negative return since 1926.
  • The S&P 500 has fallen in September 56% of the time over the past century.
  • Several theories explain this trend, including post-summer portfolio adjustments and increased bond offerings.
  • Historical data shows that September's negative impact is more pronounced during certain years, such as 1931 and 2008.
  • Despite the September Effect, long-term investors are advised to remain focused on overall market resilience.
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