The ACA helped to standardize health coverage by requiring that new health plans cover a package of essential benefits, such as maternity care and prescription drugs, and by prohibiting insurers from charging more based on gender or health status. Yet President Trump has called on federal agencies to make it easier to sell short-term policies and association health plans with skimpier benefits. Mark Hall and Michael McCue examine the impact of allowing “compliant” and “noncompliant” health plans to be sold side by side.