“…Although previous research has examined inter-state administrative burdens related to Medicaid enrollment--finding that states adopting greater administrative easing, like automating eligibility decisions, have seen higher Medicaid uptake [10] , [36] , [15] --to our knowledge, this framework has not been applied to examine differences between marketplace types. For example, due to state-based data capacities, state marketplaces may be better positioned to adapt to “churning”i.e., quickly transitioning individuals between private insurance and public insurance in response to changes in income, household, or employment circumstances [1] , [6] . Alternatively, administrative burdens may be higher in the federal marketplace, as unintended consequence, or as Peeters suggests [27] , a result of deliberate design--a fitting description, perhaps, for the Trump administration’s 2017 decision to eliminate in-person assistance for Healthcare.gov and to shorten the federal marketplace open enrollment period [23] .…”