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The use of copay coupons has been the subject of recent study in academic and policy circles, particularly on the possible effects they have on increasing healthcare costs and improving patient adherence to medications. In the February 2017 issue of The Antitrust Source, NERA Associate Directors Subbu Ramanarayanan and Bryan Ray review a recent working paper by Leemore Dafny, Christopher Ody, and Matt Schmitt, “When Discounts Raise Costs: The Effect of Copay Coupons on Generic Utilization.” In their review, Dr. Ramanarayanan and Mr. Ray describe some of the methods and analyses used in this study and discuss the implications of the study’s findings for the nature of competition in healthcare.