September Inflation Rises to 3.7%, Impact on S&P 500 Analyzed
The U.S. inflation rate rose to 3.7% in September, according to the Bureau of Labor Statistics, driven largely by a sharp increase in gasoline prices. The report caused the S&P 500 (^GSPC) to fall about 1.1%, finishing near 7,719 on October 14. Historical analysis shows that while high inflation readings have not typically led to falling stock markets, they are associated with lower average returns and reduced odds of gains in the following year. For example, after months where annualized CPI was at or above 3.5%, the S&P 500 rose about 69% of the time over the next 12 months, averaging a gain of roughly 7%. In contrast, when inflation remained below 3%, gains averaged around 11%. The data also highlights that much of this historical pattern is concentrated in periods like the high-inflation 1970s and early '80s. The timing within an inflationary cycle can significantly affect outcomes, with different results observed when a reading occurs at the peak versus during its rise.
Topics: consumer price index (CPI) inflation market reaction S&P 500