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This paper extends the seminal model of vertical product differentiation by Ronnen (1991) to a two‐tier supply chain. While Ronnen considers the duopoly case, we add a vertical structure such that each downstream firm procures an input from a monopolistic upstream supplier. While simultaneous up‐ and downstream regulation in the form of a minimum quality standard restores Ronnen's findings, if only one firm is regulated in the vertical chain, a free‐rider effect results: all the bargaining power is given to the non‐regulated member of the chain, which uses it to free‐ride on the pressure exerted by the regulator onto the other member.

Vertically Linked Industries, Product Quality and Minimum Quality Standards