Every currency crisis of recent years has been accompanied by a migration of billions of short-term money. Both experts and laymen have again and again been amazed at the speed at which, at relatively short notice, these enormous sums could be mobilised.

Since Christopher Sims’s Macroeconomics and Realityʺ (1980), macroeconomists have used structural VARs, or vector autoregressions, for policy analysis. Constructing the impulseresponse functions and variance decompositions that are central to this literature requires factoring the...

This paper studies the role of endogenous producer entry and product creation for monetary policy analysis and business cycle dynamics in a general equilibrium model with imperfect price adjustment. Optimal monetary policy stabilizes product prices, but lets the consumer price index vary to...