Most traders treat a bear market as simply "prices going down" — that framing costs them. The technical threshold of a 20% decline from recent highs is almost arbitrary. What actually defines a bear market is a sustained shift in the underlying supply-demand structure, where sellers systematically overwhelm buyers across multiple sessions and sectors simultaneously.

Bear markets don't materialise from thin air. Historically, the catalysts cluster into three categories: monetary tightening cycles, credit contraction events, and exogenous shocks. The 2000–2002 drawdown followed excessive valuation expansion in technology. The 2008–2009 episode was credit-driven. Each had a structurally different recovery profile — and traders who conflated them made predictably poor decisions.

CONCEPTBear markets triggered by credit crises historically take 2–3x longer to recover than valuation-driven selloffs.
WARNINGAveraging into a declining market without identifying the catalyst type is a structurally flawed approach.
KEY IDEADuration and depth vary enormously — the 20% rule identifies a bear market, it does not define its behaviour.

Duration data from the S&P 500 across documented bear markets since 1929 tells a sobering story. The average bear market has lasted roughly 9–18 months, but the range is extreme — from the COVID crash of 33 days to the Great Depression's multi-year grind. Median peak-to-trough drawdown sits near 35%, but secular bears embedded within broader economic contractions have reached 57% and beyond.

Bear Market: Duration vs Drawdown0204060Drawdown %2020200820001973192934%57%49%48%86%

The analytical framework worth applying is catalyst classification before position sizing. Traders historically use a three-question sequence: Is this drawdown driven by rate normalisation, credit stress, or an exogenous shock? What is the earnings revision trajectory across broad indices? Are credit spreads widening or stabilising? Resources like the Investopedia bear market guide offer solid foundational definitions, while the structural mechanics are well-documented on Wikipedia's market trend page. Understanding historical stock market crashes and bear markets reveals just how variable each episode truly is.

Historically, when credit spreads begin compressing after a peak, equity markets have tended to bottom within one to two quarters — not a rule, but a pattern worth tracking. Classifying the bear before reacting to it is the only edge that consistently separates disciplined traders from reactive ones.

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