We consider the regulation of a monopolistic market when the prin- cipal delegates to a regulatory agency two tasks: the supervision of the firm's unknown costs and the arrangement of a pricing mechanism. As usual, the agency may have an incentive to hide information from the principal to share...

We challenge the widely held belief that New-Keynesian models cannot predict optimal positive in‡ ations. We finnd that these are justified by the Phelps argument. This mainly happens because we also consider distortionary expects of public transfers. Our predictions are broadly consistent...