Multiproduct firms and product differentiation : a survey

We start the survey by reviewing the implications of horizontal and vertical product differentiation on market structure under the assumption of single-product firms. Then, we analyse the main results of the multi-product firm models, both when variants are assumed differentiated in vertical attributes only and when variants are assumed differentiated in two dimensions (vertical and horizontal). Finally, we review the empirical literature about discrete-choice models of product differentiation

Multiproduct Firms and Product Differentiation: A Survey

We start the survey by reviewing the implications of horizontal and vertical product differentiation on market structure under the assumption of single-product firms. Then, we analyse the main results of the multi-product firm models, both when variants are assumed differentiated in vertical attributes only and when variants are assumed differentiated in two dimensions (vertical and horizontal). Finally, we review the empirical literature about discrete-choice models of product differentiation

Price differentials among brands in retail distribution: product quality and service quality

We develop a theoretical model of retail competition that include two sources of quality, one inherently linked to brand characteristics and the other linked to the retailer level of service. We then measure their contribution in explaining the observed price differentials for a sample of U.K. grocery retailer prices in the south of Coventry during the period November 1995 to March 1997. We find that retailers that offer a higher quality service sell same quality brands at higher prices. These price premia are explained solely by differences in service quality levels. We find econometric evidence that they amount to 6 percent for national brands and to a range between 9 percent and 15 percent for low-quality store brands. Besides, at a given store, the price premia paid for the national brand is positive. These differentials are very large: around 150 percent between national brands and low-quality store brands, around 40 percent between national brands and high-quality store brands. Also, the price differential between the national brand and the low-quality store brand does not increase with its service quality. Besides, the price of the high-quality store brand approaches the price of the national brand when service quality increases. Thus suggesting that stores that offer high quality service uses the level of service as a strategic tool to target the leading national brand consumers