How Does Income Inequality Affect Market Outcomes in Vertically Differentiated Markets?

Yurko, Anna (2006): How Does Income Inequality Affect Market Outcomes in Vertically Differentiated Markets?

Abstract

The distribution of consumer incomes is a key factor in determining the structure of a vertically differentiated industry when consumer's willingness to pay depends on his income. This paper computes the Shaked and Sutton (1982) model for a general specification of consumers' income distribution to investigate the effect of inequality on firms' entry, product quality, and pricing decisions. The main findings are that greater inequality in consumer incomes leads to the entry of more firms and results in more intense quality competition among the entrants. This is due to the elasticity of consumer demand for quality being higher in more inegalitarian economies. More intense quality competition among firms causes them to locate their products in higher ranges of the quality spectrum, closer to each other, decreasing the degree of product differentiation. Competition between more similar products tends to reduce their prices. However, when income inequality is very high, the top quality producer chooses to serve only the rich segment of the market, and the low price elasticity of demand of these consumers allows him to charge a higher price. The conclusion is that income inequality has important implications for the degree of product differentiation, price level, industry concentration, and consumer welfare.

• Item Type: MPRA Paper
• Institution: The University of Texas at Austin
• Language: English
• Keywords: vertical differentiation; income inequality; computational game theory
• Subjects: C - Mathematical and Quantitative Methods > C6 - Mathematical Methods ; Programming Models ; Mathematical and Simulation Modeling > C61 - Optimization Techniques ; Programming Models ; Dynamic Analysis; L - Industrial Organization > L1 - Market Structure, Firm Strategy, and Market Performance > L13 - Oligopoly and Other Imperfect Markets; L - Industrial Organization > L1 - Market Structure, Firm Strategy, and Market Performance > L11 - Production, Pricing, and Market Structure ; Size Distribution of Firms

References

1.Benassi, Corrado; Alessandra Chirco, and Caterina Colombo (2006), "Vertical Differentiation and the Distribution of Income", Bulletin of Economic Research, 58(4), 345-367. 2.Berry, Steven and Joel Waldfogel (2003), "Product Quality and Market Size", National Bureau of Economic Research, Working Paper 9675. 3.Gabszewicz, J. Jaskold and J.-F. Thisse (1979), "Price Competition, Quality and Income Disparities", Journal of Economic Theory, 20, 340-359. 4.Gabszewicz, J. Jaskold and J.-F. Thisse (1980), "Entry (and Exit) in a Differentiated Industry", Journal of Economic Theory, 22, 327-338. 5.Shaked, Avner and John Sutton (1982), "Relaxing Price Competition Through Product Differentiation", Review of Economic Studies, 49(1), 3-13. 6.Shaked, Avner and John Sutton (1983), "Natural Oligopolies", Econometrica, 51(5), 1469-1484. 7.Shaked, Avner and John Sutton (1987), "Product Differentiation and Industrial Structure," The Journal of Industrial Economics, 36(2), 131-146. 8.United Nations Development Programme (2006), "Human Development Report 2006", 335.