1. The effect of Medicare Part D on evergreening, generic entry, and drug prices Author(s): Sanzenbacher, Geoffrey T., authorWettstein, Gal, author Publication: Chestnut Hill, MA : Center for Retirement Research at Boston College, May 2019 Subject(s): Drug CostsDrugs, Generic -- economicsMedicare Part D -- economicsPatents as TopicAgedDrug Industry -- economicsEconomics, PharmaceuticalHumansUnited StatesUnited States. Food and Drug Administration.Medical Expenditure Panel Survey (U.S.)