Assume that the private goods and the public good are weakly separable, the private goods are gross complements, and the private utility function is a homogeneous of degree one function with constant elasticity of substitution. We demonstrate that, under commodity taxation, the social marginal...

In this paper we study the social desirability of the structure regulation which transforms a single multi-product monopoly into an oligopoly where the industry produces differentiated complementary goods. In particular, we pay special attention to the cross-subsidization which will be...