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Using longitudinal data from the Medical Expenditure Panel Survey-Household Component (MEPS-HC), we found that nonelderly respondents in 2014-15, following implementation of ACA coverage provisions, experienced shorter periods of being uninsured than did respondents in 2012-13 and 2013-14. This was particularly true for people with preexisting (or "high-risk-pool") health conditions.
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Vistnes et al. (2018) studied this question.
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