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Are low-skill public sector workers really overpaid? A quasi-differenced panel data analysis

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  • Peter Siminski

Abstract

Public--private sectoral wage differentials have been studied extensively using quantile regression techniques. These typically find large public sector premiums at the bottom of the wage distribution. This may imply that low skill workers are ‘overpaid’, prompting concerns over efficiency. We note several other potential explanations for this result and explicitly test whether the premium varies with skill, using Australian data. We use a quasi-differenced Generalized Method of Moments (GMM) panel data model which has not been previously applied to this topic, internationally. Unlike other available methods, this technique identifies sectoral differences in returns to unobserved skill. It also facilitates a decomposition of the wage gap into components explained by differences in returns to all (observed and unobserved) skills and by differences in their stock. We find no evidence to suggest that the premium varies with skill. One interpretation is that the compressed wage profile of the public sector induces the best workers (on unobserved skills) to join the public sector in low wage occupations, vice versa in high wage occupations. We also estimate the average public sector premium to be 6% for women and statistically insignificant (4%) for men.

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  • Peter Siminski, 2013. "Are low-skill public sector workers really overpaid? A quasi-differenced panel data analysis," Applied Economics, Taylor & Francis Journals, vol. 45(14), pages 1915-1929, May.
    • Handle: RePEc:taf:applec:45:y:2013:i:14:p:1915-1929
    DOI: 10.1080/00036846.2011.641928
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    2. Raúl Ramos & Esteban Sanromá & Hipólito Simón, 2014. "Public-Private Sector Wage Differentials by Type of Contract: Evidence from Spain," Hacienda Pública Española / Review of Public Economics, IEF, vol. 208(1), pages 107-141, March.
    3. Deborah A. Cobb‐Clark & Lihini De Silva, 2021. "Participation, Unemployment, and Wages," Australian Economic Review, The University of Melbourne, Melbourne Institute of Applied Economic and Social Research, vol. 54(4), pages 482-493, December.
    4. Ayça Akarçay Gürbüz & Sezgin Polat, 2016. "Public--private wage differentials in Turkey: public policy or market dynamics?," International Review of Applied Economics, Taylor & Francis Journals, vol. 30(3), pages 326-356, May.
    5. Vladimir Gimpelson & Anna Lukiyanova & Anna Sharunina, 2015. "Estimating the Public-Private Wage Gap in Russia: What Does Quantile Regression Tell Us?," HSE Working papers WP BRP 104/EC/2015, National Research University Higher School of Economics.
    6. Kostas Mavromaras & Stephane Mahuteau & Kostas Mavromaras & Sue Richardson & Rong Zhu, 2017. "Public–Private Sector Wage Differentials in Australia," The Economic Record, The Economic Society of Australia, vol. 93, pages 105-121, June.
    7. Tansel, Aysit & Keskin, Halil Ibrahim & Ozdemir, Zeynel Abidin, 2008. "Public versus Private Sector Wage Gap in Egypt: Evidence from Quantile Regression on Panel Data," MPRA Paper 89540, University Library of Munich, Germany.
    8. Bargain, Olivier B. & Etienne, Audrey & Melly, Blaise, 2018. "Public Sector Wage Gaps over the Long-Run: Evidence from Panel Administrative Data," IZA Discussion Papers 11924, Institute of Labor Economics (IZA).
    9. Cristina Pita & Ramón J. Torregrosa, 2023. "The Education-Job Satisfaction Paradox in the Public Sector," Public Organization Review, Springer, vol. 23(4), pages 1717-1735, December.
    10. Raúl Ramos & Esteban Sanromá & Hipólito Simón, 2014. "Public-Private Sector Wage Differentials by Type of Contract: Evidence from Spain," Hacienda Pública Española, IEF, vol. 208(1), pages 107-141, March.

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    More about this item

    JEL classification:

    • J45 - Labor and Demographic Economics - - Particular Labor Markets - - - Public Sector Labor Markets
    • J31 - Labor and Demographic Economics - - Wages, Compensation, and Labor Costs - - - Wage Level and Structure; Wage Differentials
    • J38 - Labor and Demographic Economics - - Wages, Compensation, and Labor Costs - - - Public Policy

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