Memories Of Extraordinary Popular Delusions Vol. 1 is a book by Charles Mackay that looks at how common beliefs and delusions affected different historical events. The plot of this book is about a lot of different things, like the Crusades, witch hunts, and economic bubbles. The main idea of the book is that people often believe and act in ways that don't make sense, especially when they are part of a bigger group. Mackay tells in depth about events like the South Sea Bubble, the Mississippi Bubble, and the Tulip Mania, which caused many people to lose all their money. Mackay's work is known for its sharp wit and keen understanding of how people act. He gives important insights into how the mind works and the power of beliefs, which makes the book a must-read for anyone who is interested in history, psychology, or how people act.