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Variability in Stock Market Intra-month Behavior

August 1, 2025 • Posted in Calendar Effects

Does the U.S. stock market, as proxied by the S&P 500 Index (SP500) exhibit much variability in intra-month behaviors by calendar month? To investigate, we compare average daily cumulative SP500 returns across calendar months. Using daily SP500 returns during January 1990 through June 2025, we find that: (more…)

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