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Reversion to the mean is a key principle in investing, suggesting that the long-term returns of any asset class will eventually revert to their average over time. This concept can inform decision-making, allowing investors to identify undervalued stocks based on deviations from their historical averages. For instance, an active investor might observe that a stock priced at $10 is below its historical average of $9 due to recent volatility and see it as a buying opportunity. While this strategy can be effective, investors must also consider that structural changes within a company or sector could mean that prices do not return to previous norms.