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Large failures rarely come from one isolated mistake. They emerge when leverage, concentration, liquidity, correlation, and weak controls reinforce one another. These cases connect the principles in Quest for Edge with real market events. The purpose is not hindsight; it is to identify mechanisms that can also appear at a smaller scale in an individual trading account.

Cases

Archegos Capital

How leverage, concentration, and hidden exposure contributed to a multi-billion-dollar collapse.

Einar Aas

How concentrated exposure in the Nordic power market produced losses beyond available collateral.

Long-Term Capital Management

How leverage, correlation, liquidity, and model assumptions combined during market stress.

Recurring failure mechanisms

  • Leverage makes small modelling or execution errors consequential.
  • Correlations often rise when liquidity deteriorates.
  • Diversification can be superficial when positions share the same underlying factor.
  • Controls that work in normal conditions may fail under stress.
  • Survival depends on planning for outcomes outside the recent historical range.

How these cases are sourced

Historical summaries prioritize regulators, exchanges, central banks, court records, and other primary or authoritative material. The analysis distinguishes documented facts from the risk-management lessons drawn from them. See the editorial methodology.

Apply the lessons to prop trading

Translate leverage, concentration, and loss-buffer lessons into an account-level risk process.
These pages are educational summaries. Claims about historical events should be evaluated alongside the cited primary and reputable secondary sources on each case page.