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Significant Placebo Results in Difference-in-Differences Analysis: The Case of the ACA’s Parental Mandate

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  • David J G Slusky

    (Department of Economics, University of Kansas)

Abstract

The Affordable Care Act (ACA) lets young adults stay on their parents’ insurance. Several papers use age–time difference-in-differences strategies to argue this causes health insurance and labor effects. I show that difference-in-differences over “placebo” dates also produces statistically significant “effects” before ACA implementation, even with conservative adjustments. This suggests the effects attributed to the ACA could instead reflect dynamics in the age-structure of the health insurance and labor markets. Reducing the age bandwidth yields more reliable estimates of the increases in parental and overall insurance coverage. The key problem in this literature is therefore potentially overstating the ACA’s “effects” in other dimensions.

Suggested Citation

  • David J G Slusky, 2017. "Significant Placebo Results in Difference-in-Differences Analysis: The Case of the ACA’s Parental Mandate," Eastern Economic Journal, Palgrave Macmillan;Eastern Economic Association, vol. 43(4), pages 580-603, September.
    • Handle: RePEc:pal:easeco:v:43:y:2017:i:4:d:10.1057_eej.2015.49
    DOI: 10.1057/eej.2015.49
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    Cited by:

    1. Gregory Colman & Dhaval Dave, 2018. "It'S About Time: Effects Of The Affordable Care Act Dependent Coverage Mandate On Time Use," Contemporary Economic Policy, Western Economic Association International, vol. 36(1), pages 44-58, January.
    2. David J. G. Slusky & Donna K. Ginther, 2021. "Did Medicaid expansion reduce medical divorce?," Review of Economics of the Household, Springer, vol. 19(4), pages 1139-1174, December.
    3. Christopher S. Carpenter & Gilbert Gonzales Jr. & Tara McKay & Dario Sansone, 2020. "Effects of the Affordable Care Act Dependent Coverage Mandate on Health Insurance Coverage for Individuals in Same-Sex Couples," NBER Working Papers 26978, National Bureau of Economic Research, Inc.
    4. Nathan Blascak & Vyacheslav Mikhed, 2023. "Health Insurance and Young Adult Financial Distress," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 42(2), pages 393-423, March.
    5. Giuntella, Osea & Lonsky, Jakub, 2020. "The effects of DACA on health insurance, access to care, and health outcomes," Journal of Health Economics, Elsevier, vol. 72(C).
    6. Grumstrup, Ethan & Mobarak Hossain, Md. & Mukhopadhyay, Sankar & Shapoval, Olga, 2019. "The Effects of the Affordable Care Act on Workplace Absenteeism of Overweight and Obese Workers," IZA Discussion Papers 12617, Institute of Labor Economics (IZA).
    7. Michael R. Richards & Sebastian Tello‐Trillo, 2021. "Private coverage mandates, business cycles, and provider treatment intensity," Health Economics, John Wiley & Sons, Ltd., vol. 30(5), pages 1200-1221, May.
    8. Fone, Zachary S. & Friedson, Andrew I. & Lipton, Brandy & Sabia, Joseph J., 2020. "The Dependent Coverage Mandate Took a Bite Out of Crime," IZA Discussion Papers 12968, Institute of Labor Economics (IZA).
    9. Joelle Abramowitz, 2018. "Planning parenthood: the Affordable Care Act young adult provision and pathways to fertility," Journal of Population Economics, Springer;European Society for Population Economics, vol. 31(4), pages 1097-1123, October.
    10. Michael S. Kofoed & Wyatt J. Frasier, 2019. "[Job] Locked and [Un]loaded: The Effect of the Affordable Care Act Dependency Mandate on Reenlistment in the U.S. Army," Upjohn Working Papers 19-300, W.E. Upjohn Institute for Employment Research.
    11. Jie Ma & Kosali I. Simon, 2020. "Heterogeneous Effects Of Health Insurance On Birth Related Outcomes: Unpacking Compositional Vs. Direct Changes," NBER Working Papers 27728, National Bureau of Economic Research, Inc.
    12. Boungou, Whelsy & Dufau, Bastien, 2024. "EU ETS phase IV and Industrial performance," Economics Letters, Elsevier, vol. 236(C).
    13. Daeho Kim, 2022. "The Effect of the Affordable Care Act Dependent Coverage Mandate on Health Insurance and Labor Supply: Evidence from Alternative Research Designs," ILR Review, Cornell University, ILR School, vol. 75(3), pages 769-793, May.
    14. Gamino Aaron M., 2021. "The Effect of Health Insurance on Young Adult HIV Testing: Evidence from the Affordable Care Act Dependent Coverage Mandate," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 21(1), pages 147-174, January.
    15. Lee, Daeyong, 2018. "Effects of health insurance coverage on household financial portfolio: Evidence from the Affordable Care Act," Economics Letters, Elsevier, vol. 171(C), pages 176-179.
    16. Yörük Barış K., 2018. "Health insurance coverage and health care utilization: Evidence from the Affordable Care Act’s dependent coverage mandate," Forum for Health Economics & Policy, De Gruyter, vol. 21(2), pages 1-24, December.
    17. Bastian Gawellek & Bernd Süssmuth & Daniel Singh, 2016. "Tuition Fees and Instructional Quality," Economics Bulletin, AccessEcon, vol. 36(1), pages 84-91.
    18. Matt Hampton & Otto Lenhart, 2022. "The effect of the Affordable Care Act Medicaid expansion on marriage," Economic Inquiry, Western Economic Association International, vol. 60(2), pages 568-591, April.

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