This paper develops a model of successive oligopolies with endogenous market entry, allowing for varying degrees of product differentiation and entry costs in both markets. Our analysis shows that the downstream conditions dominate the overall profitability of the two-tier structure while the...

This paper studies how the emergence of specialized communication media focused on both high quality contents and high quality advertised products, affects the functioning of a vertically differentiated market. To that end, we formulate a simultaneous game of pricing and targeted advertising...