Extraordinary Popular Delusions and the Madness of Crowds is an early study of crowd psychology by Scottish journalist Charles Mackay, first published in 1841. The book was published in three volumes: ‘National Delusions’, ‘Peculiar Follies’, and ‘Philosophical Delusions’. Mac Kay was an accomplished teller of stories, though he wrote in a journalistic and somewhat sensational style.
The subjects of Mackay’s debunking include alchemy, crusades, duels, economic bubbles, fortune-telling, haunted houses, the Drummer of Tedworth, the influence of politics and religion on the shapes of beards and hair, magnetisers (influence of imagination in curing disease), murder through poisoning, prophecies, popular admiration of great thieves, popular follies of great cities, and relics. Present-day writers on economics, such as Michael Lewis and Andrew Tobias, laud the three chapters on economic bubbles.
In later editions, Mackay added a footnote referencing the Railway Mania of the 1840s as another ‘popular delusion’ which was at least as important as the South Sea Bubble. Mathematician Andrew Odlyzko has pointed out, in a published lecture, that Mackay himself played a role in this economic bubble; as leader writer in the Glasgow Argus, Mackay wrote on 2 October 1845: ‘There is no reason whatever to fear a crash’.
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