The irrationally exuberant highs and lows of the 1920s can help students recognize boom and bust cycles past, present, and future. Speculation--an economic reality for centuries--is a hallmark of the modern U.S. economy. But how does speculation work? Is it really caused, as some insist, by popular delusions and the madness of crowds, or do failed regulations play a greater part? And why is it that investors never seem to learn the...