Template-Type: ReDIF-Paper 1.0 Author-Name: Qianjun Lyu Author-Name-First: Qianjun Author-Name-Last: Lyu Author-Email: Author-Workplace-Name: Institute for Microeconomics, University of Bonn Title: Optimal Refund Mechanism Abstract: This paper studies the optimal refund mechanism when an uninformed buyer can privately acquire information about his valuation over time. In principle, a refund mechanism can specify the odds that the seller requires the product returned while issuing a (partial) refund, which we call stochastic return. It guarantees the seller a strictly positive minimum revenue and facilitates intermediate buyer learning. In the benchmark model, stochastic return is sub-optimal. The optimal refund mechanism takes simple forms: the seller either deters learning via a well-designed non-refundable price or encourages full learning and escalates price discrimination via free return. This result is robust to both good news and bad news framework. Length: 52 pages Classification-JEL: D82, D86, L15 Keywords: buyer learning, refund contract, information design, implementable mechanism Creation-Date: 2022-12 File-URL: https://www.econtribute.de/RePEc/ajk/ajkdps/ECONtribute_214_2022.pdf File-Format: Application/pdf File-Function: First version, 2022 Number: 214 Handle: RePEc:ajk:ajkdps:214