We develop a theory for the optimal interaction between monetary and fiscal policy. While one might initially think that monetary and fiscal policy should pull in the same direction, we show within a simple model that this is not always the case. If there are small costs of changing the interest...

We study how monetary policy should respond to shocks which permanently alter the steady state structure of the economy. In such a case monetary policy affects not only the short run misallocations due to nominal rigidities, but also relative prices which stimulate reallocation of capital. We...

Standard (S,s) models of lumpy investment allow us to match many aspects of the micro data, but it is well known that the implied interest rate sensitivity of investment is unrealistically large. The monetary transmission mechanism is therefore a particularly clean experiment to assess the...