A bear market is a drop of 20% or more in a major stock index from its recent peak. A bull market is a rise of 20% or more from a recent trough. These two phases define the stock market cycle and dictate how investors feel about risk, spending, and the economy.
The S&P 500 has experienced 26 bear markets since 1928 — and recovered from every single one.
Key Definitions at a Glance
| Term | Definition | Typical Trigger |
|---|---|---|
| Bull market | 20%+ rise from trough | Economic growth, low rates, strong earnings |
| Bear market | 20%+ drop from peak | Recession fears, rate hikes, crisis events |
| Correction | 10–19% drop from peak | Profit-taking, uncertainty |
| Crash | Rapid 20%+ drop (days/weeks) | Panic selling, unexpected shock |
| Rally | Short-term price rise within a trend | Can happen within a bear market |
A correction is not a bear market — it is a normal, healthy part of market cycles that occurs roughly once a year.
Historical Bear Markets (S&P 500)
| Bear Market | Peak to Trough Decline | Duration | Recovery Time |
|---|---|---|---|
| Great Depression (1929–1932) | -86% | ~34 months | ~25 years |
| Dot-com bust (2000–2002) | -49% | ~31 months | ~7 years |
| Financial crisis (2007–2009) | -57% | ~17 months | ~5.5 years |
| COVID crash (2020) | -34% | 1 month | ~5 months |
| 2022 bear market | -25% | ~10 months | ~2 years |
Average bear market: -36% decline over 9.6 months.
Historical Bull Markets (S&P 500)
| Bull Market | Total Gain | Duration |
|---|---|---|
| 1949–1956 | +267% | 86 months |
| 1982–1987 | +229% | 60 months |
| 1990–2000 | +417% | 113 months |
| 2009–2020 | +401% | 131 months (longest ever) |
| 2020–2022 | +114% | 21 months |
Bull markets last much longer than bear markets on average. The average bull market since 1928 has lasted approximately 2.7 years.
What Causes Each Phase?
Bear Market Catalysts
- Interest rate hikes that raise borrowing costs
- Recession or anticipated economic contraction
- Financial system stress (bank failures, credit crises)
- Geopolitical shocks (wars, pandemics, energy crises)
- Extreme overvaluation correcting
Bull Market Catalysts
- Low interest rates stimulating borrowing and investment
- Strong corporate earnings growth
- Economic expansion and low unemployment
- Technological innovation opening new markets
- Easy monetary and fiscal policy
Worked Example: Dollar-Cost Averaging in a Bear Market
Sarah invests $500/month in an S&P 500 index fund. The market drops 30% over 10 months, then recovers fully.
| Month | Price per Share | Shares Bought | Running Shares |
|---|---|---|---|
| 1 (peak) | $500 | 1.0 | 1.0 |
| 3 (–15%) | $425 | 1.18 | ~4.0 |
| 6 (–25%) | $375 | 1.33 | ~8.3 |
| 10 (–30%) | $350 | 1.43 | ~14.5 |
| 14 (recovery) | $500 | 1.0 | ~19.5 |
At full recovery, Sarah owns ~19.5 shares at $500 = $9,750 invested with $8,500 contributed. The bear market helped her by letting her buy more shares cheaply. Stopping contributions during the bear market would have cost her this advantage.
How to Invest in Each Environment
In a Bull Market
- Stay invested; let compound growth work
- Rebalance to your target allocation if stocks become oversized
- Resist the urge to time the top — consistently wrong for most investors
- Maintain your emergency fund so you never have to sell at a bad time
In a Bear Market
- Continue regular contributions (dollar-cost averaging)
- Rebalance — buy more stocks as bonds hold value relative to equities
- Tax-loss harvest — sell losers to offset gains elsewhere in your portfolio
- Avoid checking your portfolio daily — emotional decisions are costly
- Do not sell to cash unless your time horizon has fundamentally changed
Indicators Investors Watch
| Indicator | Bear Signal | Bull Signal |
|---|---|---|
| Yield curve | Inverted (10yr < 2yr) | Normal/steep |
| Unemployment | Rising | Falling or low |
| Consumer confidence | Falling sharply | High and rising |
| Corporate earnings | Declining | Growing |
| Market P/E ratio | Falling | Expanding |
See the Investment Portfolio Basics guide for how to build a portfolio that can weather both bull and bear markets.
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