We explore how private drug plans set cost-sharing in the context of Medicare Part D. While publicly-provided drug coverage typically involves uniform cost-sharing across drugs, we document substantial heterogeneity in the cost-sharing for different drugs within privately-provided plans. We also document that private plans systematically set higher consumer cost sharing for drugs or classes associated with more elastic demand; to do so we estimate price elasticities of demand across more than 150 drugs and across more than 100 therapeutic classes. We conclude by discussing the various channels that likely affect private plans' cost-sharing decisions.

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社会保险的私人提供：特定药物的价格弹性和医疗保险 D 部分的成本分摊

我们探讨了私人药物计划如何在 Medicare D 部分的背景下设定费用分摊。虽然公共提供的药物承保通常涉及各种药物的统一费用分摊，但我们记录了私人提供的计划中不同药物的费用分摊存在很大的异质性。我们还记录了私人计划系统地为与需求弹性更大的药物或类别设定了更高的消费者成本分摊；为此，我们估算了 150 多种药物和 100 多种治疗类别的需求价格弹性。最后，我们讨论了可能影响私人计划成本分摊决策的各种渠道。