Extraordinary Popular Delusions and the Madness of Crowds
Extraordinary Popular Delusions and the Madness of Crowds is a history of popular folly by Scottish journalist Charles Mackay, first published in 1841. The book chronicles its subjects in three parts: "National Delusions", "Peculiar Follies", and "Philosophical Delusions". Despite its journalistic and rather sensational style, the book has gathered a body of academic support as a work of considerable importance in the history of social psychology and psychopathology.
The subjects of Mackay's debunking include economic bubbles, alchemy, crusades, witch-hunts, prophecies, fortune-telling, magnetisers (influence of imagination in curing disease), shape of hair and beard (influence of politics and religion on), murder through poisoning, haunted houses, popular follies of great cities, popular admiration of great thieves, duels, and relics. Present day writers on economics, such as Andrew Tobias and Michael Lewis, laud the three chapters on economic bubbles. Scientist and astronomer Carl Sagan mentioned the book in his own discussion about pseudoscience, popular delusions, and hoaxes.
Volume I 
Economic bubbles 
Among the bubbles or financial manias described by Mackay are the South Sea Company bubble of 1711–1720, the Mississippi Company bubble of 1719–1720, and the Dutch tulip mania of the early seventeenth century. According to Mackay, during this bubble, speculators from all walks of life bought and sold tulip bulbs and even futures contracts on them. Allegedly some tulip bulb varieties briefly became the most expensive objects in the world during 1637. Mackay's accounts are enlivened by colorful, comedic anecdotes, such as the Parisian hunchback who supposedly profited by renting out his hump as a writing desk during the height of the mania surrounding the Mississippi Company.
Two modern researchers, Peter Garber and Anne Goldgar, independently conclude that Mackay greatly exaggerated the scale and effects of the Tulip bubble, and Mike Dash, in a footnote to his modern popular history of the alleged bubble states that he believes the importance and extent of the tulip mania was overstated.
The section on 'alchemysts' focuses primarily on efforts to turn base metals into gold. Mackay notes that many of these practitioners were themselves deluded, convinced that these feats could be performed if they discovered the correct old recipe or stumbled upon the right combination of ingredients. Although alchemists gained money from their sponsors, mainly noblemen, he notes that the belief in alchemy by sponsors could be hazardous to its practitioners, as it wasn't rare for an unscrupulous noble to imprison a supposed alchemist until he could produce gold.
Other chapters 
- Modern Prophecies.
- The Magnetisers.
- Influence of Politics and Religion on the Hair and Beard.
Volume II 
The history of the crusades is described as a kind of mania of the Middle Ages, precipitated by the pilgrimages of Europeans to the Holy lands. Mackay is generally unsympathetic to the crusaders whom he compares unfavourably to the superior civilisation of Asia. "Europe expended millions of her treasures, and the blood of two milions of her children; and a handful of quarrelsome knights retained possession of Palestine for about one hundred years!" Kurt Vonnegut's Slaughterhouse Five quotes part of the introduction to this section: "History in its solemn page informs us that the crusaders were but ignorant and savage men, that their motives were those of bigotry unmitigated, and that their pathway was one of blood and tears."
Witch mania 
Witch trials in 16th and 17th century Western Europe are the primary focus of the Witch Mania section of the book, which asserts that this was a time when ill fortune was likely to be attributed to supernatural causes. Mackay notes that many of these cases were initiated as a way of settling scores among neighbors or associates, and that extremely low standards of evidence were applied to most of these trials. Mackay claims that "thousands upon thousands" of people were executed as witches over two and a half centuries, with the largest numbers being killed in Germany and Spain.
Other chapters 
- The Slow Poisoners.
- Haunted Houses.
- Popular Follies of Great Cities.
- Popular Admiration of Great Thieves.
- Duels and Ordeals.
Influence and modern responses 
The book is still in print. Writers continue to discuss the influence of the book, particularly the section on financial bubbles. Financial writer Michael Lewis includes the financial mania chapters in his book The Real Price of Everything: Rediscovering the Six Classics of Economics as one of the six great works of economics, along with writings by Adam Smith, Thomas Malthus, David Ricardo, Thorstein Veblen, and John Maynard Keynes.
James Surowiecki in The Wisdom of Crowds takes a different view of crowd behavior, saying that under certain circumstances, crowds or groups may have better information and make better decisions than even the best informed individual. Robert Bartholomew and Hilary Evans wrote Outbreak! The Encyclopedia of Extraordinary Social Behavior to be like a modern extension of Mackay's work which is more sympathetic to the point of view of participants.
Financier Bernard Baruch credited the lessons he learned from Extraordinary Popular Delusions and the Madness of Crowds with his decision to sell all his stock ahead of the financial crash of 1929.
Author and executive coach Marshall Goldsmith discussed the book in depth in BusinessWeek, drawing extensive parallels between the financial bubbles Mackay wrote about and financial bubbles today. Other writers also frequently point to the book to explain recent financial bubbles.
Forbes magazine compared Mackay's descriptions of financial bubbles to the Chinese stock bubble of 2007, claiming that the "emotional feedback loop" that drove the Chinese market was very similar to what Mackay described.
- "Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, and one by one."
- "Of all the offspring of Time, Error is the most ancient, and is so old and familiar an acquaintance, that Truth, when discovered, comes upon most of us like an intruder, and meets the intruder's welcome."
- "How flattering to the pride of man to think that the stars on their courses watch over him, and typify, by their movements and aspects, the joys or the sorrows that await him! He, in less proportion to the universe than the all-but invisible insects that feed in myriads on a summer's leaf are to this great globe itself, fondly imagines that eternal worlds were chiefly created to prognosticate his fate."
- "We go out of our course to make ourselves uncomfortable; the cup of life is not bitter enough to our palate, and we distill superfluous poison to put into it, or conjure up hideous things to frighten ourselves at, which would never exist if we did not make them."
See also 
- Lewis, Michael (2008). The Real Price of Everything.
- Sagan, Carl (1995). The Demon-Haunted World
- Garber, Peter M. (2001). Famous First Bubbles.
- Dash, Mike (2001). Tulipomania : The Story of the World's Most Coveted Flower & the Extraordinary Passions It Aroused.
- Vonnegut, Kurt, Jr. (1971). Slaughterhouse Five.
- Lewis, Michael (2008). The Real Price of Everything.
- Surowiecki, James (2004). The Wisdom of Crowds.
- Bernard Baruch, My Own Story, New York: Henry Holt, 1957, p.242-245.
- Gaiman, Neil (1991). The Sandman Vol. 3: Dream Country.
- "The Madness of Crowds, Past and Present". BusinessWeek. Retrieved 2009-10-01.
- "The books cashing in on the crash". The Independent (London). 2009-11-20. Retrieved 2009-11-23.
- Streitfeld, David; Healy, Jack (2009-04-29). "Phoenix Leads the Way Down in Home Prices". The New York Times. Retrieved 2009-11-23.
- Delasantellis, Julian (2007-03-16). "The subprime dominoes in motion". Asia Times. Retrieved 2010-11-15.
- "To be honest, it's totally random". New Statesman. Retrieved 2009-10-12.
- "China Bubble Mania". Forbes. 2007-05-30. Retrieved 2009-10-30.
- Ohayon, Albert. "John Law and the Mississippi Bubble: The Madness of Crowds". NFB.ca Blog. National Film Board of Canada. Retrieved 22 June 2011.
- MacKay, Charles (1980). Extraordinary Popular Delusions and the Madness of Crowds (with a foreword by Andrew Tobias, 1841). New York: Harmony Books. ISBN 978-0-517-54123-4. OCLC 5750576.
- Dash, Mike (1999). Tulipomania: The Story of the World's Most Coveted Flower and the Extraordinary Passions It Aroused. New York: Crown Publishers. ISBN 978-0-609-60439-7. OCLC 41967050.
- Garber, Peter M. (2000). Famous First Bubbles: The Fundamentals of Early Manias. Cambridge, MA: MIT Press. ISBN 978-0-262-57153-1. OCLC 43552719.
- Goldgar, Anne (2007). Tulipmania: Money, Honor, and Knowledge in the Dutch Golden Age. Chicago: University of Chicago Press. ISBN 978-0-226-30125-9. OCLC 76897793.
- Phillips, Tim (2009). Charles Mackay's Extraordinary Popular Delusions and the Madness of Crowds: A Modern-day Interpretation of a Finance Classic. Oxford: Infinite Ideas. ISBN 978-1-905-94091-2.
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