The function of monetary policy to alter the informational content of money price signals is examined in a model where traders can observe an economy wide financial signal and a local commodity price. Under a passive policy, money demand disturbances, which are not directly observable, are shown to be confused with real productivity shocks and thereby preclude prices from fully reflecting all information. Even when the policy authority has no informational advantage, prospective money growth feedback rules can “improve” the structure of available information.

We explore a managerial model of investment behaviour in which an incentive problem arises because one input factor (managerial effort) is not publicly observed. We show that an optimal incentive contract leads to investment levels which are below first-best in low states and that this phenomenon can account for greater cyclical variability in aggregate production and investment. From the perspective of incentive scheme design, a special feature of the model is that screening takes place over two variables (investment and output) rather than one as is customary.