Originally published in the 19th century and reissued by Templeton Foundation Press in 2000, Extraordinary Popular Delusions examines how crowd psychology fuels speculative frenzies and widespread beliefs. The book surveys famous episodes — from tulip mania to the South Sea and Mississippi schemes — to show how optimism and herd behavior overwhelm reason.

Beyond finance, chapters explore alchemy, prophetic cults, comets-as-omens, Rosicrucian lore, and astrology, revealing how many delusions grow from sincere ideas that spiral into mass conviction. The writing blends historical narrative with sharp observation about human nature and recurring patterns.

Key themes

• Psychology of crowds and speculative bubbles
• Historical case studies of frauds and fads
• Origins and spread of mass beliefs
• Lessons on repeating patterns in public behavior

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