Booms and Busts with dispersed information

This paper lays down a model where dispersed information generates booms and busts in economic activity. Boom-and-bust dynamics start when firms are initially over-optimistic about demand due to an aggregate noise shock in their signals. Consequently, they over-produce, which generates a boom. This however also depresses their mark-ups, which, to firms, signals low demand and overturns their expectations, generating a bust. This emphasizes a novel role for imperfect common knowledge: dispersed information makes firms ignorant about their competitors' actions, which makes them confuse high noise-driven supply with low fundamental demand. Boom-and-bust episodes are more dramatic when the aggregate noise shocks are more unlikely and when congestion effects are stronger.