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An Index Approach to Measuring Product Differentiation: A Hedonic Analysis of Airfares

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  • Charles Howell
  • Emili Grifell‐Tatjé

Abstract

The main objective of this paper is to introduce an Allen‐type index of differentiation based on cost functions. With this index, we create an economic measure of product differentiation that quantifies differences between products. Applied research has some generally accepted economic measures, for example, the Herfindahl–Hirschman Index for market concentration, or the Gini coefficient for inequality. Product differentiation, however, does not yet have an established measure. Our objective is to fill that gap and introduce a measure that can be used in market‐related applied research such as market power, antitrust, price indexes, or market strategy. To operationalize the index, we introduce the concept of a core product and use cost functions to measure the degree of differentiation from the core product. To demonstrate the use of the index, we study the effect of product differentiation on price formation in the airline industry using an enhanced hedonic model. The model is empirically tested on 103,980 observations of quarterly US domestic airfare data between 2002 and 2016 and shows that product differentiation has a significant effect on both price and mark‐up.

Suggested Citation

  • Charles Howell & Emili Grifell‐Tatjé, 2023. "An Index Approach to Measuring Product Differentiation: A Hedonic Analysis of Airfares," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 69(4), pages 952-974, December.
    • Handle: RePEc:bla:revinw:v:69:y:2023:i:4:p:952-974
    DOI: 10.1111/roiw.12612
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    1. Feenstra, Robert C, 1995. "Exact Hedonic Price Indexes," The Review of Economics and Statistics, MIT Press, vol. 77(4), pages 634-653, November.
    2. Zou, Bo & Hansen, Mark, 2012. "Impact of operational performance on air carrier cost structure: Evidence from US airlines," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 48(5), pages 1032-1048.
    3. James J. Heckman & Rosa L. Matzkin & Lars Nesheim, 2010. "Nonparametric Identification and Estimation of Nonadditive Hedonic Models," Econometrica, Econometric Society, vol. 78(5), pages 1569-1591, September.
    4. Leonard Kostovetsky & Jerold B. Warner, 2020. "Measuring Innovation and Product Differentiation: Evidence from Mutual Funds," Journal of Finance, American Finance Association, vol. 75(2), pages 779-823, April.
    5. Christensen, Laurits R & Jorgenson, Dale W & Lau, Lawrence J, 1973. "Transcendental Logarithmic Production Frontiers," The Review of Economics and Statistics, MIT Press, vol. 55(1), pages 28-45, February.
    6. Lorraine Ivancic & Kevin J. Fox, 2013. "Understanding Price Variation Across Stores and Supermarket Chains: Some Implications for CPI Aggregation Methods," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 59(4), pages 629-647, December.
    7. Caves, Richard E & Williamson, Peter J, 1985. "What Is Product Differentiation, Really?," Journal of Industrial Economics, Wiley Blackwell, vol. 34(2), pages 113-132, December.
    8. Ariel Pakes, 2003. "A Reconsideration of Hedonic Price Indexes with an Application to PC's," American Economic Review, American Economic Association, vol. 93(5), pages 1578-1596, December.
    9. Arjomandi, Amir & Seufert, Juergen Heinz, 2014. "An evaluation of the world's major airlines' technical and environmental performance," Economic Modelling, Elsevier, vol. 41(C), pages 133-144.
    10. Steven C Bourassa & Eva Cantoni & Martin Hoesli, 2016. "Robust hedonic price indexes," International Journal of Housing Markets and Analysis, Emerald Group Publishing Limited, vol. 9(1), pages 47-65, March.
    11. John P. Harding & Stuart S. Rosenthal & C. F. Sirmans, 2003. "Estimating Bargaining Power in the Market for Existing Homes," The Review of Economics and Statistics, MIT Press, vol. 85(1), pages 178-188, February.
    12. Kelvin J. Lancaster, 1966. "A New Approach to Consumer Theory," Journal of Political Economy, University of Chicago Press, vol. 74(2), pages 132-132.
    13. Severin Borenstein, 1989. "Hubs and High Fares: Dominance and Market Power in the U.S. Airline Industry," RAND Journal of Economics, The RAND Corporation, vol. 20(3), pages 344-365, Autumn.
    14. Hanson, Torbjørn, 2016. "Efficiency and productivity in the operational units of the armed forces: A Norwegian example," International Journal of Production Economics, Elsevier, vol. 179(C), pages 12-23.
    15. P. D. Chwelos & E. R. Berndt & I. M. Cockburn, 2008. "Faster, smaller, cheaper: an hedonic price analysis of PDAs," Applied Economics, Taylor & Francis Journals, vol. 40(22), pages 2839-2856.
    16. Tsionas, Efthymios G., 2003. "Combining DEA and stochastic frontier models: An empirical Bayes approach," European Journal of Operational Research, Elsevier, vol. 147(3), pages 499-510, June.
    17. Gayle, Philip G. & Yimga, Jules O., 2018. "How much do consumers really value air travel on-time performance, and to what extent are airlines motivated to improve their on-time performance?," Economics of Transportation, Elsevier, vol. 14(C), pages 31-41.
    18. Robert J. Hill, 2013. "Hedonic Price Indexes For Residential Housing: A Survey, Evaluation And Taxonomy," Journal of Economic Surveys, Wiley Blackwell, vol. 27(5), pages 879-914, December.
    19. David H. Good & Robin C. Sickles & Jesse C. Weiher, 2008. "A Hedonic Price Index For Airline Travel," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 54(3), pages 438-465, September.
    20. Richard H. Spady & Ann F. Friedlaender, 1978. "Hedonic Cost Functions for the Regulated Trucking Industry," Bell Journal of Economics, The RAND Corporation, vol. 9(1), pages 159-179, Spring.
    21. Douglas W. Caves & Laurits R. Christensen & Michael W. Tretheway, 1984. "Economies of Density versus Economies of Scale: Why Trunk and Local Service Airline Costs Differ," RAND Journal of Economics, The RAND Corporation, vol. 15(4), pages 471-489, Winter.
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