In a vertically differentiated oligopoly where the high quality variant of the good requires the use of the high quality labour (available in¯fixed supply) ¯firms may either all supply the same quality or di®erentiate their product. Only di®erentiated outcomes can be optimal, but the number...

This paper analyses price competition under product differentiation when goods are defined in a two dimensional characteristic space, and consumers do not know which firm sells which quality. Equilibrium prices consist of two additive terms, which balance consumers' relative valuation of goods'...