We investigate the long-run impact of environmental regulations on the intra-industry distribution of firm-level productivity and the resulting aggregate variables. In a general-equilibrium model that accounts for endogenous entry/exit of heterogeneous firms, neither the average productivity of...

Regulators often do not regulate all firms competing in a given sector. Due to product substitutability, unregulated competitors have incentives to bribe regulated firms to have them overstate their costs and produce less, thereby softening competition. The best collusion-proof contract entails...

Entrants may provide information to a regulator, even when they cannot be regulated. With correlated costs, yardstick-like regulatory contracts based on the output of unregulated firms nullify information rents. But they give strong incentives to the regulated incumbent to bribe competitors. A...