published in: Economic Inquiry, 2024, 62 (3), 1009-1023.
We examine the effects of patient cost-sharing on adolescents' healthcare utilization and out-of-pocket medical expenditures by exploiting the healthcare reform in South Korea that lowered the coinsurance rate for inpatient care from 20% to 5% for children under 16. We apply a difference-in-regression-discontinuities design using administrative claims data. We find that the reform increased adolescents' inpatient care utilization. It also reduced
out-of-pocket healthcare expenditures. This effect was larger among low-income households, facilitating income redistribution. However, the lack of evidence on health improvements and household consumption spending responses suggests that generous patient cost-sharing for adolescent healthcare may cause efficiency losses.
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