What market history actually teaches
· beginner
Automated material · TradeAlmanac editorial deskDraft prepared by a language model from our stored data; not reviewed by an editor.
People usually try to extract a forecast from history. What comes out instead is a list of what breaks regularly.
Leverage breaks
In every episode leveraged positions were closed by force, and the owner lost the chance to wait for a recovery — Why leverage ruins the result even when the forecast is right.
Concentration breaks
A portfolio depending on one factor shares that factor's fate entirely — Hidden concentration: when twenty securities are one bet.
Assumptions of normal conditions break
Correlations rise, liquidity disappears, spreads widen — all at once and exactly when they were being counted on — Correlation: why diversification sometimes stops working, Portfolio liquidity risk: how long an exit would take.
Confidence breaks
Decisions taken in a panic turned out worse than inaction almost every time.
What survives
A portfolio without leverage, spread across asset classes, with a reserve outside the market and a horizon longer than the typical recovery period.
It is a dull conclusion, and it is the only one that repeats in every episode.
Related: How a bubble works: the general pattern and Asset allocation: the decision that shapes everything else.
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Draft prepared by a language model from our stored data; not reviewed by an editor.
Model: claude-opus-5
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