Most traders dramatically overestimate how predictable bull markets are at their peaks. The consensus view — that rising markets simply continue rising until some obvious catalyst appears — ignores what historical data actually shows. Bull markets tend to die quietly, strangled by tightening credit conditions and deteriorating breadth, long before the headline news catches up.
The S&P 500's post-GFC bull run from 2009 to 2020 lasted roughly eleven years, making it the longest on record. But that outlier distorts expectations. The average bull market across the 20th and 21st centuries runs closer to four to five years, with median gains around 150%. Traders anchoring to recent history are essentially navigating with the wrong map.
The structural killers of bull markets follow a recognisable sequence. First, central banks tighten aggressively in response to inflation. Credit spreads widen. Small-cap and cyclical stocks begin rolling over while large-cap indices still appear healthy — a dangerous divergence. Historically, when fewer than 50% of stocks in an index trade above their 200-day moving average during an apparent market high, it signals distribution, not accumulation.
The analytical framework worth applying is a three-factor cross-check: yield curve slope, advance-decline line trajectory, and high-yield credit spread direction. Historically, when all three deteriorate simultaneously over a six-to-twelve month window, every major bull market since 1970 has been within eighteen months of its peak. None of this is prediction — it is pattern recognition applied with discipline. Traders wanting deeper context on these dynamics can reference the mechanics of bull market cycles on Investopedia, the structural role of yield curve analysis in cycle identification, and the broader history of market trends on Wikipedia for comparative cycle data across global exchanges.
Bull markets reward patience and punish complacency in equal measure — the traders who survive multiple cycles are the ones who never confuse duration with permanence.
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