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Job lock : evidence from a regression discontinuity design

  • Robert W. Fairlie
  • Kanika Kapur
  • Susan M. Gates

Employer-provided health insurance in the United States is suspected of restricting job mobility, resulting in “job lock.” Previous research on job lock finds mixed results using several methodologies. We take a new approach to examine whether employer-based health insurance discourages job mobility by exploiting the discontinuity created at age 65 through the qualification for Medicare. Using a novel procedure for identifying age in months from matched monthly CPS data and a relatively unexplored administration measure of job mobility, we compare job mobility among male workers in the months just prior to turning age 65 to job mobility in the months just after turning age 65. We find no evidence that job mobility increases at the age 65 threshold when Medicare eligibility starts. Our results are robust to different bandwidths, non-linear age profiles, and frequency of age measurement. The upper bounds of 95 percent confidence intervals for these estimates can rule out the existence of any job lock in some cases, and in most cases can rule out the large levels of job lock found in many previous studies in the literature. We also do not find evidence that other factors such as retirement, reduction in hours worked, social security eligibility, pension eligibility, and sample changes confound the results on job mobility in the month individuals turn 65.

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Paper provided by School of Economics, University College Dublin in its series Working Papers with number 201215.

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Date of creation: Apr 2012
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Handle: RePEc:ucn:wpaper:201215
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  1. Fairlie, Robert W. & Kapur, Kanika & Gates, Susan, 2011. "Is employer-based health insurance a barrier to entrepreneurship?," Journal of Health Economics, Elsevier, vol. 30(1), pages 146-162, January.
  2. Richard W. Johnson & Amy J. Davidoff & Kevin Perese, 2003. "Health Insurance Costs and Early Retirement Decisions," ILR Review, Cornell University, ILR School, vol. 56(4), pages 716-729, July.
  3. Ludwig, Jens & Miller, Douglas L., 2006. "Does Head Start Improve Children's Life Chances? Evidence from a Regression Discontinuity Design," IZA Discussion Papers 2111, Institute for the Study of Labor (IZA).
  4. Bradley, Cathy J. & Neumark, David & Barkowski, Scott, 2013. "Does employer-provided health insurance constrain labor supply adjustments to health shocks? New evidence on women diagnosed with breast cancer," Journal of Health Economics, Elsevier, vol. 32(5), pages 833-849.
  5. David Card & Carlos Dobkin & Nicole Maestas, 2007. "Does Medicare Save Lives?," NBER Working Papers 13668, National Bureau of Economic Research, Inc.
  6. Kanika Kapur, 1998. "The Impact of Health on Job Mobility: A Measure of Job Lock," ILR Review, Cornell University, ILR School, vol. 51(2), pages 282-298, January.
  7. Kanika Kapur, 1998. "The impact of health on job mobility : a measure of job lock," Open Access publications 10197/297, School of Economics, University College Dublin.
  8. Hamersma, Sarah & Kim, Matthew, 2009. "The effect of parental Medicaid expansions on job mobility," Journal of Health Economics, Elsevier, vol. 28(4), pages 761-770, July.
  9. Bruce Fallick & Charles A. Fleischman & James B. Rebitzer, 2005. "Job-Hopping in Silicon Valley: Some Evidence Concerning the Micro-Foundations of a High Technology Cluster," Economics Working Paper Archive wp_432, Levy Economics Institute.
  10. Brigitte C. Madrian, 1994. "Employment-Based Health Insurance and Job Mobility: Is there Evidence of Job-Lock?," The Quarterly Journal of Economics, Oxford University Press, vol. 109(1), pages 27-54.
  11. Guido Imbens & Thomas Lemieux, 2007. "Regression Discontinuity Designs: A Guide to Practice," NBER Working Papers 13039, National Bureau of Economic Research, Inc.
  12. Melissa A. Boyle & Joanna N. Lahey, 2007. "Health Insurance and the Labor Supply Decisions of Older Workers: Evidence from the U.S. Department of Veterans Affairs," Working Papers, Center for Retirement Research at Boston College wp2007-23, Center for Retirement Research, revised Dec 2007.
  13. Donna B. Gilleskie & Byron F. Lutz, 1999. "The Impact of Employer-Provided Health Insurance on Dynamic Employment Transitions," NBER Working Papers 7307, National Bureau of Economic Research, Inc.
  14. Dey, M. S. & Flinn, C. J., 2000. "An Equilibrium Model of Health Insurance Provision and Wage Determination," Working Papers 00-18, C.V. Starr Center for Applied Economics, New York University.
  15. David Card & Carlos Dobkin & Nicole Maestas, 2005. "The Impact of Health Insurance Status on Treatment Intensity and Health Outcomes," Working Papers 505, RAND Corporation.
  16. Jonathan Gruber & Brigitte C. Madrian, 1994. "Health Insurance and Job Mobility: The Effects of Public Policy on Job-Lock," ILR Review, Cornell University, ILR School, vol. 48(1), pages 86-102, October.
  17. Guido Imbens & Karthik Kalyanaraman, 2010. "Optimal bandwidth choice for the regression discontinuity estimator," CeMMAP working papers CWP05/10, Centre for Microdata Methods and Practice, Institute for Fiscal Studies.
  18. Kevin T. Stroupe & Eleanor D. Kinney & Thomas J.J. Kniesner, 2001. "Chronic Illness and Health Insurance-Related Job Lock," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 20(3), pages 525-544.
  19. Nicole Maestas & Julie Zissimopoulos, 2010. "How Longer Work Lives Ease the Crunch of Population Aging," Journal of Economic Perspectives, American Economic Association, vol. 24(1), pages 139-60, Winter.
  20. James M. Poterba & Steven F. Venti, 2004. "The Transition to Personal Accounts and Increasing Retirement Wealth: Macro- and Microevidence," NBER Chapters, in: Perspectives on the Economics of Aging, pages 17-80 National Bureau of Economic Research, Inc.
  21. David Card & Carlos Dobkin & Nicole Maestas, 2008. "The Impact of Nearly Universal Insurance Coverage on Health Care Utilization: Evidence from Medicare," American Economic Review, American Economic Association, vol. 98(5), pages 2242-58, December.
  22. Mark C. Berger & Dan A. Black & Frank A. Scott, 2004. "Is There Job Lock? Evidence from the Pre-HIPAA Era," Southern Economic Journal, Southern Economic Association, vol. 70(4), pages 953-976, April.
  23. Alicia H. Munnell & Steven A. Sass, 2007. "The labor supply of older American men," Monograph, Federal Reserve Bank of Boston, number 52.
  24. Bruce C. Fallick & Charles A. Fleischman, 2004. "Employer-to-employer flows in the U.S. labor market: the complete picture of gross worker flows," Finance and Economics Discussion Series 2004-34, Board of Governors of the Federal Reserve System (U.S.).
  25. Scott J. Adams, 2004. "Employer-provided Health Insurance and Job Change," Contemporary Economic Policy, Western Economic Association International, vol. 22(3), pages 357-369, 07.
  26. Anna Sanz-De-Galdeano, 2006. "Job-Lock and Public Policy: Clinton's Second Mandate," ILR Review, Cornell University, ILR School, vol. 59(3), pages 430-437, April.
  27. Royalty, Anne Beeson & Abraham, Jean M., 2006. "Health insurance and labor market outcomes: Joint decision-making within households," Journal of Public Economics, Elsevier, vol. 90(8-9), pages 1561-1577, September.
  28. Boyle, Melissa A. & Lahey, Joanna N., 2010. "Health insurance and the labor supply decisions of older workers: Evidence from a U.S. Department of Veterans Affairs expansion," Journal of Public Economics, Elsevier, vol. 94(7-8), pages 467-478, August.
  29. David S. Lee & Thomas Lemieux, 2009. "Regression Discontinuity Designs in Economics," NBER Working Papers 14723, National Bureau of Economic Research, Inc.
  30. Joyce Manchester & Jae Song, 2008. "Have People Delayed Claiming Retirement Benefits? Responses to Changes in Social Security Rules: Working Paper 2008-04," Working Papers 19575, Congressional Budget Office.
  31. David S. Lee & David Card, 2006. "Regression Discontinuity Inference with Specification Error," NBER Technical Working Papers 0322, National Bureau of Economic Research, Inc.
  32. Alicia H. Munnell & Steven A. Sass, 2007. "The Labor Supply of Older Americans," Working Papers, Center for Retirement Research at Boston College wp2007-12, Center for Retirement Research, revised Jun 2007.
  33. Cynthia Bansak & Steven Raphael, 2008. "The State Children's Health Insurance Program and Job Mobility: Identifying Job Lock among Working Parents in Near-Poor Households," ILR Review, Cornell University, ILR School, vol. 61(4), pages 564-579, July.
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