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City size, employer concentration, and wage income inequality

Author

Listed:
  • Halvarsson, Daniel

    (Ratio Institute)

  • Korpi, Martin

    (Ratio Institute & EHFF, Stockholm School of Economics)

Abstract

This study investigates the relationship between the urban wage premium and employer concentration using Swedish full population employer-employee data. Departing from an AKM modeling framework to distinguish worker from firm specific heterogeneity – a measure of rent-sharing – we then measure the urban wage premium using differences in the estimated firm fixed effects at the level of local industries, nested within local labor markets. Our results suggest that labor market employer concentration, as calculated using the Hirschman-Herfindahl index and a leave-one-out instrumental variable design, can account for a significant share of the estimated urban wage premium (UWP). Addressing city-level wage income inequality by applying our model to different segments of the local labor market income distribution, we find that while the UWP pertains to all income segments, it is largest for top-income levels (above the 90th percentile), and within this segment employer concentration also has the largest explanatory power. Thus, while being an important explanatory factor for all percentiles of the local income distribution, a relatively lower employer concentration within larger cities, and vice versa, higher concentration within smaller cities, primarily help explain the variance of top wages within these cities/labor markets.

Suggested Citation

  • Halvarsson, Daniel & Korpi, Martin, 2025. "City size, employer concentration, and wage income inequality," Working Paper Series 2025:4, IFAU - Institute for Evaluation of Labour Market and Education Policy.
  • Handle: RePEc:hhs:ifauwp:2025_004
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    References listed on IDEAS

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    1. Giulia Faggio & Kjell G. Salvanes & John Van Reenen, 2010. "The evolution of inequality in productivity and wages: panel data evidence," Industrial and Corporate Change, Oxford University Press and the Associazione ICC, vol. 19(6), pages 1919-1951, December.
    2. Orley Ashenfelter & David Card & Henry Farber & Michael R. Ransom, 2022. "Monopsony in the Labor Market: New Empirical Results and New Public Policies," Journal of Human Resources, University of Wisconsin Press, vol. 57(S), pages 1-10.
    3. Paulo Guimarães & Pedro Portugal, 2010. "A simple feasible procedure to fit models with high-dimensional fixed effects," Stata Journal, StataCorp LLC, vol. 10(4), pages 628-649, December.
    4. Chad Syverson, 2011. "What Determines Productivity?," Journal of Economic Literature, American Economic Association, vol. 49(2), pages 326-365, June.
    5. Boris Hirsch & Elke J. Jahn & Alan Manning & Michael Oberfichtner, 2022. "The Urban Wage Premium in Imperfect Labor Markets," Journal of Human Resources, University of Wisconsin Press, vol. 57(S), pages 111-136.
    6. Pierre-Philippe Combes & Gilles Duranton & Laurent Gobillon, 2011. "The identification of agglomeration economies," Journal of Economic Geography, Oxford University Press, vol. 11(2), pages 253-266, March.
    7. Katz, Lawrence F. & Autor, David H., 1999. "Changes in the wage structure and earnings inequality," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 3, chapter 26, pages 1463-1555, Elsevier.
    8. David Card & Ana Rute Cardoso & Patrick Kline, 2016. "Bargaining, Sorting, and the Gender Wage Gap: Quantifying the Impact of Firms on the Relative Pay of Women," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 131(2), pages 633-686.
    9. John M. Abowd & Francis Kramarz & David N. Margolis, 1999. "High Wage Workers and High Wage Firms," Econometrica, Econometric Society, vol. 67(2), pages 251-334, March.
    10. Yankow, Jeffrey J., 2006. "Why do cities pay more? An empirical examination of some competing theories of the urban wage premium," Journal of Urban Economics, Elsevier, vol. 60(2), pages 139-161, September.
    11. Combes, Pierre-Philippe & Duranton, Gilles & Gobillon, Laurent & Roux, Sébastien, 2012. "Sorting and local wage and skill distributions in France," Regional Science and Urban Economics, Elsevier, vol. 42(6), pages 913-930.
    12. David Card & Ana Rute Cardoso & Joerg Heining & Patrick Kline, 2018. "Firms and Labor Market Inequality: Evidence and Some Theory," Journal of Labor Economics, University of Chicago Press, vol. 36(S1), pages 13-70.
    13. repec:hal:pseose:halshs-00754585 is not listed on IDEAS
    14. Wheeler, Christopher H., 2006. "Cities and the growth of wages among young workers: Evidence from the NLSY," Journal of Urban Economics, Elsevier, vol. 60(2), pages 162-184, September.
    15. Timothy Dunne & Lucia Foster & John Haltiwanger & Kenneth R. Troske, 2004. "Wage and Productivity Dispersion in United States Manufacturing: The Role of Computer Investment," Journal of Labor Economics, University of Chicago Press, vol. 22(2), pages 397-430, April.
    16. Combes, Pierre-Philippe & Duranton, Gilles & Gobillon, Laurent, 2008. "Spatial wage disparities: Sorting matters!," Journal of Urban Economics, Elsevier, vol. 63(2), pages 723-742, March.
    17. Kevin Rinz, 2022. "Labor Market Concentration, Earnings, and Inequality," Journal of Human Resources, University of Wisconsin Press, vol. 57(S), pages 251-283.
    18. Anna Sokolova & Todd Sorensen, 2021. "Monopsony in Labor Markets: A Meta-Analysis," ILR Review, Cornell University, ILR School, vol. 74(1), pages 27-55, January.
    19. Martin Korpi & William A.V. Clark, 2019. "Migration and occupational careers: The static and dynamic urban wage premium by education and city size," Papers in Regional Science, Wiley Blackwell, vol. 98(1), pages 555-574, February.
    20. Alessia Matano & Paolo Naticchioni, 2016. "What Drives The Urban Wage Premium? Evidence Along The Wage Distribution," Journal of Regional Science, Wiley Blackwell, vol. 56(2), pages 191-209, March.
    21. Kim, Sunwoong, 1990. "Labor heterogeneity, wage bargaining, and agglomeration economies," Journal of Urban Economics, Elsevier, vol. 28(2), pages 160-177, September.
    22. Acemoglu, Daron & Autor, David, 2011. "Skills, Tasks and Technologies: Implications for Employment and Earnings," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 4, chapter 12, pages 1043-1171, Elsevier.
    23. Cardoso, Ana Rute, 1997. "Workers or Employers: Who Is Shaping Wage Inequality?," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 59(4), pages 523-547, November.
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    More about this item

    Keywords

    wage distribution; rent sharing; monopsony; linked employer-employee data; local labor markets;
    All these keywords.

    JEL classification:

    • D22 - Microeconomics - - Production and Organizations - - - Firm Behavior: Empirical Analysis
    • J31 - Labor and Demographic Economics - - Wages, Compensation, and Labor Costs - - - Wage Level and Structure; Wage Differentials
    • J42 - Labor and Demographic Economics - - Particular Labor Markets - - - Monopsony; Segmented Labor Markets
    • R12 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General Regional Economics - - - Size and Spatial Distributions of Regional Economic Activity; Interregional Trade (economic geography)

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