Historical Perspective Offers Reassurance for Investors Ahead of Potential Bear Market

Yahoo Finance · 2026-08-29

Since the end of World War II, the market has recorded 12 official bull cycles, lasting an average of five and a half years. The ongoing bull run, which kicked off on Oct. 12, 2022, is nearing its fourth year. The S&P 500 has generated a total return of 128% during this period, though it appears historically pricey at 30 times trailing earnings. Consequently, a future downturn is inevitable, with historical bear markets averaging a 32% peak-to-trough drop over the past eight decades. However, historical data reveals an encouraging trend: bear markets are considerably briefer than bull markets, averaging merely 1.2 years. Consequently, equities spend approximately 78% of their timeline in expansion. This asymmetry occurs because selling driven by panic accelerates downward momentum much faster than gradual upward climbs, triggering cascades of liquidations and margin calls.

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Since WWII, the S&P 500 has recorded 12 bull markets lasting an average of 5.5 years, but it is currently up 128% with a high valuation of 30x. Historically, bear markets last an average of 1.2 years, much shorter than bull markets, and the stock market spends 78% of its total time in an expansion phase. Investors must understand the cycles of panic-driven sharp selling and leverage liquidation to prepare for volatility.

상승 영향

Stock Market — Historically since WWII, the stock market has spent 78% of its time in an expansion phase, and bull markets (average 5.5 years) last much longer than bear markets (average 1.2 years), which is favorable for long-term investors.

하락 영향

Stock Market — The S&P 500 is in a historically overvalued phase with a 30x valuation, making entry into a bear market imminent, and sharp selling pressure may occur due to leverage liquidation along with an average 32% decline from the peak.

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As the current valuation of the S&P 500 has reached 30x, higher than the historical average, the possibility of entering a future bear market is increasing. However, historical data shows that entering a bear market results in an average decline of 32%, but due to panic selling, the decline period tends to end quickly, averaging 1.2 years.

In a bullish scenario, investors can utilize market resilience and the longevity of the expansion phase as a buying opportunity centered on blue-chip stocks. In a bearish scenario, investors must guard against additional sharp drops caused by margin calls from leveraged investors. Volatility indicators (VIX) and corporate earnings trends should be used as key monitoring metrics going forward.

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