Market Cycles and Crashes

Market Cycles and Crashes distinguishes sustained market trends from abrupt price events. A bull or bear market describes a period measured from a stated benchmark level; a market correction describes a drawdown convention; and a crash emphasizes speed, breadth, severity, and market functioning. For surprise, model uncertainty, and rare-event terminology, use Black Swan in the tail-risk section.

The distinction matters because one trading session can be part of a longer cycle, a severe decline can occur without a prior bubble, and the same index move can produce very different investor losses depending on leverage, liquidity, currency, and portfolio composition.

Key Terms in This Branch

Analysis Sequence

1. Define the benchmark, market, region, asset universe, and observation period.
2. State whether the calculation uses closing or intraday prices and price or total return.
3. Specify the currency and whether foreign-exchange effects are included.
4. Distinguish a market label from its proposed cause: a crash, bear market, bubble, recession, and liquidity crisis are not synonyms.
5. Separate preconditions, triggers, amplifiers, and transmission channels.
6. Measure leverage, margin, collateral, funding maturity, concentration, and forced-sale exposure.
7. Test market liquidity, order-book depth, spreads, execution capacity, and settlement needs under stress.
8. Document data sources, market holidays, index methodology changes, and any threshold convention used.

Common Mistakes

• Applying a 20% bear-market convention without naming the benchmark, peak, closing-price basis, or currency.
• Calling every fast decline a crash without considering breadth, speed, liquidity, and market functioning.
• Assuming a crash proves that a prior asset bubble was identifiable in real time.
• Treating a black-swan label as a synonym for any large loss.
• Comparing one country’s price index with another market’s total return.
• Ignoring leverage and forced selling when translating an index decline into investor or institutional loss.
• Assuming trading halts prevent losses or guarantee orderly reopening prices.

Market-cycle labels are descriptive tools, not forecasts or personalized trading signals. These pages provide general financial education and do not recommend entering or exiting a market.

In this section

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