Historically, S&P 500/SPY has seen just ~8-14 instances of 9-10 consecutive green days since 1930 (rare: ~every 5-10 years). After these streaks end: – Day 11 (next day): often negative, with longer streaks showing bigger avg losses (mean reversion). – Days 12-15 (next ~1
S&P 500 Nine-Day Green Streaks: Historical Patterns and Mean Reversion
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