Memoirs of Extraordinary Popular Delusions is an early study of crowd psychology by Scottish journalist Charles Mackay. The book chronicles its subjects in three parts: "e;National Delusions"e;, "e;Peculiar Follies"e;, and "e;Philosophical Delusions"e;. MacKay was an accomplished teller of stories, though he wrote in a journalistic and somewhat sensational style. The subjec...