Previous studies have shown that regulated firms diversify for reasons that are different than for unregulated firms. We explore some of these differences by providing a theoretical model that starts by considering the firm-regulator relationship as an incomplete information issue, in which a...

This paper considers the effect of taxes on the definition of relevant markets in antitrust analysis by examining various measures used within the hypothetical monopoly test. We show that the use of net margins (between producer prices and marginal cost) is a proper correction, but that it is...

Ramsey regulation, in the context of tariff rebalancing, is analyzed when the regulator is not fully informed about the cost structure of the firm. It is shown that even if the estimated relation between variable costs of the two goods produced is correct, errors regarding the composition of a...