25 — Market Cycles

Mean Reversion Psychology#

◐ Behavioral
◆ The PatternExtremes revert to the mean — in statistics AND in psychology.

Mean reversion psychology — the principle that extremes in both price and sentiment revert toward their long-term average.

Statistical basis: Regression to the mean (Galton, 1886). Extreme observations are followed by less extreme ones — not by "correction" but by probability.

Market application:
• Extreme euphoria → sentiment reverts toward neutral (prices fall)
• Extreme panic → sentiment reverts toward neutral (prices rise)
• P/E ratios, VIX, and yield spreads all exhibit mean-reverting behavior

Patience is the key: wait for the extreme, then let mean reversion work in your favor.

Pattern bridge: The belief that extremes return to average — a psychological trust in the central limit theorem. In ML, normalization layers enforce mean reversion on activations.
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