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*Is there an objective definition of a crash?
**Barro and Ursua 2009: multi-year real returns of –25% or less. They also define a depression as multi-year macroeconomic declines of 10% or more. Crashes and correlated with minor depressions 31% of the time, and major depressions 10% of the time. In reverse, minor depressions are associated with crashes 71% of the time and major ones 92% of the time.... Part of this analysis entails splitting the sample into different “bins” or categories, defined by the magnitudes of the stockmarket crashes or by the type of environment that characterized those events; for example, wars, currency or banking crises, and periods of global economic distress.
*Is there a taxonomy of stock market crashes?
*Are there standard measures of a crash?
