What Is a Bull Market?

A bull market is a period when stock prices rise 20% or more from recent lows, accompanied by optimism and investor confidence.

Bull Market Definition

Official trigger: Index up 20% from low

Duration: Significantly longer than bear markets (average 3-7 years)

Opposite: Bear market (20%+ decline)

Duration and Frequency

Bull markets occur more frequently than bear markets and last longer.

Average bull market: 4-5 years Average return during bull market: 100-150%

Longest bull markets:

1. 2009-2020: 11 years, +400% return
2. 1987-2000: 13 years, +500% return (includes correction but recovered)
3. 1982-1987: 5 years, +225% return

The longest bull markets compound to extraordinary returns.

Bull Market Characteristics

Economic: Growing GDP, falling unemployment, rising earnings

Sentiment: Optimism, FOMO (fear of missing out), "can't lose" mentality

Valuations: P/E ratios expand; stocks become expensive

Risk appetite: Investors buy risky assets (small-cap stocks, cryptocurrencies, speculative ventures)

Returns: Both stocks and bonds often rise together (unusual, but happens when economy grows)

Historical Bull Markets

1987-2000 technology boom:

• Return: +500%
• Duration: 13 years
• Ended: Dot-com crash (2000-2002), -49% decline

2003-2007 housing boom:

• Return: +100%
• Duration: 5 years
• Ended: Financial crisis (2008), -57% decline

2009-2020 post-financial crisis:

• Return: +400%
• Duration: 11 years
• Characteristics: Began at market lows; included COVID-19 shock but recovered

2020-2021 COVID recovery:

• Return: +70%
• Duration: 1 year (then peaked)
• Ended: Inflation/rate hikes (2022), -19% decline

The Power of Bull Market Timing

Missing the best days of bull markets is devastating:

Example: S&P 500, 1990-2020

• Full period return: +600%
• Miss best 10 days: Return drops to +380% (-37% reduction)
• Miss best 20 days: Return drops to +190% (-68% reduction)
• Miss best 30 days: Return drops to +60% (-90% reduction)

About 1-3% of trading days produce most of the annual returns. If you're not invested during those days, you miss them.

This is why market timing is near-impossible: you can't predict which days will be best.

Bull Market Phases

Early phase: Recovery from bear market

• Prices still low
• Few investors interested (fear remains)
• Valuations attractive
• Returns strong (+100%+ possible)

Mid phase: Economic recovery

• Growth accelerates
• Earnings rising
• More investors interested
• Returns strong (+50-100% possible)

Late phase: Overconfidence

• Valuations stretched
• Speculation increases
• "Everyone knows stocks only go up"
• Returns modest (+10-20%)

Peak: Transition to bear market

• Valuations at extremes
• Fed tightens policy
• Returns turn negative

Valuations During Bull Markets

Valuations rise during bull markets, making future returns less attractive:

Early bull (2009):

• S&P 500 P/E: 13 (cheap)
• Next 10-year return: ~9% annually

Mid bull (2014):

• S&P 500 P/E: 17 (fair)
• Next 10-year return: ~7% annually

Late bull (2020):

• S&P 500 P/E: 25 (expensive)
• Next 10-year return: ~4% annually

Peak bull (early 2021):

• S&P 500 P/E: 35-40 (extremely expensive)
• Next 10-year return: ~3% annually (or negative if valuations reset)

As bull markets extend, valuations compress future returns. This is why late-bull-market entries are riskier than early-bull entries.

Behavioral Pitfalls During Bull Markets

1. Overconfidence: Beating the market becomes easy (everything rises); investors believe their skill is responsible

2. FOMO: Missing out feels worse than losses. Investors buy near peaks to avoid missing gains.

3. Chasing performance: Buying hot sectors (tech in 2020, crypto in 2021) at peak valuations

4. Leverage: Taking on debt to amplify returns; this works until it doesn't (margin calls during reversals)

5. Abandoning diversification: Concentrating in winners (stocks during 2009-2020 meant selling bonds); leaves portfolios vulnerable

Bull Market Investment Strategy

Early (2009 scenario):

• Valuations cheap
• Buy aggressively
• High allocation to stocks
• Hold through cycle

Mid (2014 scenario):

• Valuations fair
• Maintain allocation
• Continue regular contributions
• Resist overconfidence

Late (2020 scenario):

• Valuations stretched
• Take profits (rebalance)
• Reduce risk (add bonds)
• Prepare for reversal

The Reality

Timing the exact peak is impossible. Even professional investors rarely sell at the peak. The better approach:

1. Maintain allocation discipline
2. Rebalance (sells winners, buys losers) as valuations extend
3. Ignore narrative that "this time is different"
4. Remember: bull markets always end; bear markets always end

The Bottom Line

Bull markets are longer-lasting than bear markets and produce most of stock market returns. Valuations expand during bull markets, compressing future returns. The key to success is staying invested (to capture gains), maintaining discipline (to avoid chasing peaks), and rebalancing (to lock in gains and prepare for reversals).

When the cycle turns

Every bull market eventually tempts investors with the phrase this time is different. Carmen Reinhart and Kenneth Rogoff's book of that name traces eight centuries of booms and busts to show why it almost never is.