We analyze a location-choice model with two vertically differentiated firms and two regions with different consumer income. We find that the high-quality producer settles in the poor region and the low-quality one in the rich region when income disparities are sufficiently high and goods are...

We analyze the effect of competition in market-accessibility enhancement among quality-differentiated firms. Firms are located in regions with different ex-ante transport costs to reach the final market. We characterize the equilibrium of the two-stage game in which firms first invest to improve...

We revisit Maxwell's (1998) analysis to show that his results are incompatible with the assumption of full market coverage. As a consequence, the effects of MQS regulation on the high-quality firm's incentive to adopt a more efficient technology cannot be assessed in this model.

We examine a vertically differentiated duopoly where firms invest in process and product innovation and then compete in prices under full market coverage. We show that (i) process innovation fosters (hinders) product innovation for the low-quality (high-quality) firm; (ii) the firm which is...