Competition, Monopoly, and Aftermarkets
研究耐用商品生产商垄断其产品售后市场（如维修）是否降低福利，发现垄断反而可能减少低效、提升社会与消费者福利，且此类情况比以往文献认为的更常见。
Consider a durable goods producer that has the option of monopolizing an aftermarket such as repair for its own product. An important question is whether such monopolization reduces welfare? We show that the answer to this question is frequently no. In particular, we explore three models that illustrate various ways in which aftermarket monopolization can reduce inefficiencies and thus increase social welfare and frequently also consumer welfare. Our article shows that efficiency enhancing aftermarket monopolization may be much more common than previous literature suggests.