A monopolistic advertiser-supported television station chooses the program quality to serve (potential) viewers whose preferences may be skewed towards low or high program quality. The monopolist's profit-maximizing choice of program quality is completely characterized for fixed advertising time...

The existing literature on "two-sided markets" addresses participation externalities, but so far it has neglected pecuniary externalities between competing platforms. In this paper we build a model that incorporates both externalities. In our setup differentiated platforms compete in advertising...