""We are the apes who tell stories," writes William Bernstein. "And no matter how misleading the narrative, if it is compelling enough it will nearly always trump the facts." As Bernstein shows in his eloquent and persuasive new book, The Delusions of Crowds, throughout human history, compelling stories have catalyzed the spread of contagious narratives through susceptible groups-with enormous, often disastrous consequences. Inspired by Charles Mackay's...