Raging Bull: First study to find causation between testosterone levels and stock market instability. Increasing testosterone levels in men, who make up the majority of professional stock market traders, causes them to bid up prices, which create price bubbles and crashes.

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Raging Bull: First study to find causation between testosterone levels and stock market instability. Increasing testosterone levels in men, who make up the majority of professional stock market traders, causes them to bid up prices, which create price bubbles and crashes.