Back to Library

Extraordinary Popular Delusions and the Madness of Crowds

by Charles Mackay (1841)

Quick summary -- an in-depth PhD-level extended summary (10-30 pages) for this book is coming soon.

Extraordinary Popular Delusions and the Madness of Crowds

by Charles Mackay

Overview

Originally published in 1841 under the title Memoirs of Extraordinary Popular Delusions, this is one of the most frequently cited books in financial literature. Charles Mackay, a Scottish poet and journalist, documented episodes of mass delusion spanning centuries. The financial chapters remain essential reading for anyone seeking to understand market bubbles and panics.

The Three Great Financial Manias

The first section, most relevant to investors, covers three speculative episodes:

  1. The Mississippi Scheme (1719-1720): John Law's creation of the Banque Royale and the Mississippi Company in France, which promised enormous returns from Louisiana's supposed riches. The resulting speculative frenzy drove shares to extraordinary heights before the inevitable collapse ruined thousands.

  2. The South Sea Bubble (1720): The South Sea Company's scheme to assume Britain's national debt in exchange for trade monopoly rights. Share prices soared on wild speculation, spawning dozens of copycat "bubble companies" before the crash devastated the British economy.

  3. Tulipomania (1634-1637): The Dutch tulip mania, during which single bulbs traded for the price of houses. Futures markets developed, speculation spread from merchants to all social classes, and the eventual collapse left a lasting cautionary tale about asset price disconnection from intrinsic value.

Broader Delusions

Beyond financial manias, Mackay covers the Crusades, witch trials, alchemy, fortune-telling, and other episodes of collective irrationality. These chapters reinforce the broader theme that humans are prone to mass hysteria across all domains of life.

Enduring Relevance

The book's power lies in demonstrating that the psychological mechanisms driving speculative manias -- greed, fear of missing out, herd behavior, suspension of critical judgment -- are constant across centuries and cultures. Every subsequent bubble (1929, dot-com, housing) has echoed the patterns Mackay documented. The foreword by Andrew Tobias notes that the first hundred pages on money mania alone are "worth many times its purchase."

For Traders and Investors

Mackay provides the historical foundation for understanding behavioral finance, contrarian investing, and the importance of maintaining independent judgment when markets become euphoric or panicked.