This paper examines ways of taxing monopolistically competitive firms that pollute the environment. There are two sources of welfare loss: production externalities and product selection bias associated with fixed costs. We argue that the optimal firm specific tax is always, strictly speaking,...

In a two-stage Cournot oligopoly cost minimization sometimes calls for ex ante identical firms to invest in diverse technologies. It is an implication of this result that it might be optimal to treat identical duopolistic polluters asymmetrically. We discuss the efficiency properties of a...