A headline result from the Oregon Health Insurance Experiment is that emergency room (ER) utilization increased. A seemingly contradictory result from the Massachusetts health reform is that ER utilization decreased. I reconcile both results by identifying treatment effect heterogeneity within...

Measured in percentage points, the Affordable Care Act will, by 2015, add about fourteen times more to average marginal labor income tax rates nationwide than the Massachusetts health reform added to average rates in Massachusetts following its 2006 statewide health reform. The rate impacts are...

We studied the impact of Affordable Care Act navigator programs on health insurance coverage, using the 80% cut in program funding under the Trump administration as a natural experiment. Our study design exploited county-level differences in the navigator program prior to funding cuts. We did...

Some states that have not adopted the Affordable Care Act (ACA) Medicaid expansions have stated concerns that the expansions may impair access to care and utilization for those who are already insured. We investigate such negative spillovers using a large panel of Medicare beneficiaries. Across...