The Nature of Manias, Bubbles and Crashes: Introduction -- Value Trading vs. Momentum Trading -- The Rise of Manias and Bubbles -- Stages in the Boom-Bubble-Bust Sequence -- Fueling the Boom - Role of the Media -- Bubbles, Wealth and Inflation -- Speculations, Bootstraps and Swindles -- The...

We explore the dynamic effects of news about a future technology improvement which turns out ex post to be overoptimistic. We find that it is difficult to generate a boom-bust cycle (a period in which stock prices, consumption, investment and employment all rise and then crash) in response to...