Extraordinary popular delusions and the madness of crowds

Abstract

Mass irrationality and collective psychopathology manifest across various historical epochs, frequently overriding individual reason in favor of group-driven delusions. Economic history reveals recurring asset bubbles, such as the seventeenth-century Dutch tulip trade and the eighteenth-century financial schemes in France and Britain, where speculative frenzies led to systemic collapse driven by social contagion and the suspension of rational fiscal judgment. Beyond economic volatility, human societies have repeatedly succumbed to pervasive ideological and religious manias, including the centuries-long Crusades and the lethal hysteria of European witch trials. These phenomena are often facilitated by the emergence of influential charlatans—ranging from alchemists and “magnetisers” to self-proclaimed prophets—who exploit universal human desires for wealth, health, and foreknowledge of the future. Societal traditions regarding dueling, haunted houses, and the veneration of relics further demonstrate how irrational beliefs can become institutionalized through the power of imitation. These disparate historical events suggests that human behavior is fundamentally gregarious, characterized by periodic “crowd madness” that subsides only through gradual enlightenment or the exhaustion of the delusion. The persistent nature of these historical errors highlights the susceptibility of the collective mind to misinformation and emotional impulse, even when such behaviors contradict the long-term interests of the community. – AI-generated abstract.