A long bull market is bad for investors in roughly the way a long peace is bad for armies. Skills atrophy. Caution looks like cowardice. The behaviors that get rewarded in the calm period are the ones that get punished when conditions change. Most retail investors learn investing during bull markets, internalize lessons that work for those conditions, and find out the lessons don’t generalize when the market does what markets occasionally do.
What bull markets teach
In a sustained uptrend, almost every decision works. Buying overvalued stocks works because they get more overvalued. Holding through dips works because the dips end quickly. Concentrated bets work because the concentrated names keep winning. Margin works because the trend covers the cost. Dollar-cost-averaging works, but so does panic-buying, and the data point that most stays with new investors is that aggression paid.
The result is an investor who has been positively reinforced for behaviors that depend on market conditions continuing. A 25-year-old who started investing in 2009 reached their late twenties having seen exactly one significant correction (2020) that resolved within months. The 2008–2009 collapse is something they read about. The dot-com bust is ancient history. Their actual investing experience is a 13-year uptrend with brief, quickly-recovered interruptions.
Survivorship bias in the role-model pool
The investing personalities who become famous during bull markets are the ones whose strategies happened to work in those conditions. Loud, confident, concentrated bets get attention because they generate huge returns. The investors quietly compounding 8% in diversified portfolios produce no content, no Twitter following, no book deals. They also tend to be the ones still solvent after the cycle turns.
New investors entering during a bull market disproportionately learn from the visible winners — many of whom will be visibly less successful in the next environment. The historical record is full of formerly famous fund managers, traders, and prophets whose careers ended quietly when their style went out of phase. The pattern is reliable and the lesson keeps not transferring.
The leverage problem in particular
Cheap money plus rising markets makes leverage look like a free lunch. Margin accounts, options strategies, leveraged ETFs, and crypto perpetuals all generate returns in a uptrend that can’t be matched by unlevered positions. Investors who add leverage during the upswing often forget that leverage cuts both ways and that the same instruments amplify drawdowns.
The 2022 selloff offered a small preview. Crypto leverage cascades wiped out billions. ARK-style growth-stock concentration produced 70%+ drawdowns. Many of the investors who were heroes in 2020 and 2021 were quietly reduced to fractions of their peak. The market correction wasn’t even severe by historical standards.
The bottom line
A bull market is a stress test the system is failing without anyone noticing. Investors who learn during them tend to overestimate their skill, underestimate downside risk, and build portfolios that depend on the upward trend continuing. The most useful investing experience is the one that includes a real bear market — and the second most useful is reading carefully about the ones you missed. Bull markets feel like education. They’re often training you for the wrong test.
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