- Book published in 1841 studying crowd psychology through financial bubbles, crusades, witch trials, and other collective manias.
- Uses anecdotes like Dutch tulip mania to debunk delusions; influential for understanding market crashes and speculation.
- Includes contents such as The Mississippi Scheme, The South-Sea Bubble, The Tulipomania, alchemy, prophecies, and witch trials.
- Public domain eBook with multiple download formats for e-readers; Project Gutenberg offers free access.