In recent decades, market power has increased substantially, according to multiple measures that describe industry concentration, mark-ups, and business profitability. While market power can generate benefits, it also raises vexing policy concerns, including the potential for adverse effects on...

We consider the problem of repeatedly choosing policies to maximize social welfare. Welfare is a weighted sum of private utility and public revenue. Earlier outcomes inform later policies. Utility is not observed, but indirectly inferred. Response functions are learned through experimentation....

We consider the problem of repeatedly choosing policies to maximize social welfare. Welfare is a weighted sum of private utility and public revenue. Earlier outcomes inform later policies. Utility is not observed, but indirectly inferred. Response functions are learned through experimentation....

We show how corrective taxation can improve the efficiency properties of tradable quotas systems affected by market power. Indeed, when only a subset of firms are price takers while the remaining firms enjoy market power, we show that, if the regulator sets an ad hoc taxation on firms' traded...