We survey the theoretical literature on market liquidity. The literature traces illiquidity, i.e., the lack of liquidity, to underlying market imperfections. We consider six main imperfections: participation costs, transaction costs, asymmetric information, imperfect competition, funding...

The conventional wisdom suggests that a stricter enforcement policy can reduce pollution emissions. Nevertheless, this present paper argues that this assertion does not necessarily hold if the stringency of environmental regulation is subject to the influence of lobbying. A stricter enforcement...

This paper shows how a stationary tax policy can optimally address a flow externality associated with resource extraction when the policymaker faces asymmetric information. In the model I consider, the policymaker must set policy in each period before the realization of a price shock. Resource...