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Classic 1841 Book on Mass Hysteria and Financial Manias Available Free Online

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Charles Mackay's 'Extraordinary Popular Delusions and the Madness of Crowds,' first published in 1841, has been shared on Hacker News via a free Project Gutenberg link. The book is a landmark work examining historical episodes of collective irrationality, including financial bubbles and social crazes. It remains widely referenced in discussions about crowd psychology and investor behavior. The Hacker News post attracted modest engagement with 9 points and one comment.

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