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Fiscal Federalism and the Budget Impacts of the Affordable Care Act's Medicaid Expansion

Author

Listed:
  • Jonathan Gruber
  • Benjamin D. Sommers
Abstract
Medicaid’s federal-state matching system of financing is the nation’s largest example of fiscal federalism. Using generous federal subsidies, the Affordable Care Act incentivized states to expand Medicaid, which became a state option in the aftermath of a 2012 Supreme Court ruling. As of early 2020, 14 states had not yet expanded, with concerns over state budgetary effects described as a key barrier. We use an event-study approach to analyze state budget data from 2010-2018 and assess the effects of state Medicaid expansion decisions. We find that Medicaid expansion increased total spending in expansion states by 6% to 9%, compared to non-expansion states. By source of funds, federal spending via the states increased by 10% in the first year of Medicaid expansion, rising to 27% in 2018. Changes in spending from state funding were modest and non-significant, with less than a 1% change from baseline annually in the most recent years, 2017 and 2018. Meanwhile, we find no evidence that increased Medicaid spending from expansion produced any reductions in spending on education, corrections, transportation, or public assistance. Changes in Medicaid spending tracked closely with the baseline pre-ACA (2013) uninsured rate in each states, with expansion leading to roughly $2680 in added annual spending per uninsured adult. As a result, we estimate states that didn’t expand Medicaid passed up $43 billion in federally-subsidized program funds in 2018. Finally, state projections in the aggregate were reasonably accurate, with expansion states projecting average Medicaid spending from 2014-2018 within 2 percent of the actual amounts, and in fact overestimating Medicaid spending in most years.

Suggested Citation

  • Jonathan Gruber & Benjamin D. Sommers, 2020. "Fiscal Federalism and the Budget Impacts of the Affordable Care Act's Medicaid Expansion," NBER Working Papers 26862, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:26862
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    References listed on IDEAS

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    2. Petra Gram Cavalca & Mette Ejrnæs & Mette Gørtz, 2022. "Trading off fiscal budget adherence and child protection," PLOS ONE, Public Library of Science, vol. 17(3), pages 1-15, March.
    3. Gicheva, Dora & Anand, Priyanka, 2020. "The Impact of the ACA Medicaid Expansions on the Employment and Academic Progress of College Students," UNCG Economics Working Papers 20-3, University of North Carolina at Greensboro, Department of Economics.
    4. Jonathan Gruber & Johanna Catherine Maclean & Bill Wright & Eric Wilkinson & Kevin G. Volpp, 2020. "The effect of increased cost‐sharing on low‐value service use," Health Economics, John Wiley & Sons, Ltd., vol. 29(10), pages 1180-1201, October.
    5. Stefano DellaVigna & Woojin Kim, 2022. "Policy Diffusion and Polarization across U.S. States," NBER Working Papers 30142, National Bureau of Economic Research, Inc.

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    More about this item

    JEL classification:

    • H77 - Public Economics - - State and Local Government; Intergovernmental Relations - - - Intergovernmental Relations; Federalism
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health

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