1. The effect of shopping and premium tax credits on the affordability of marketplace coverage Publication: [Washington, D.C.] : Department of Health and Human Services, Office of the Assistant Secretary for Planning and Evaluation, August 24, 2016 Subject(s): Health Insurance Exchanges -- economicsTaxes -- economicsInsurance Coverage -- economicsChoice BehaviorEconomic CompetitionHealth Care CostsUnited StatesUnited States.