Unraveling Reduces Mobility in a Labor Market: Gastroenterology with and without a Centralized Match
比较了美国消化内科医生初级市场在集中匹配机制（1986-1996年）与前后分散市场中的流动性，发现集中匹配时医生流动性更高，更少留在实习医院，说明集中匹配不仅协调时间还扩大了市场范围。
The entry-level market for American gastroenterologists was organized by a centralized clearinghouse from 1986 to 1996. Before, and since, it has been conducted via a decentralized market in which appointment dates have unraveled to well over a year before the start of employment. We find that, both before and after the years in which the centralized clearinghouse was used, gastroenterologists are less mobile and more likely to be employed at the same hospital in which they were internal medicine residents than when the clearinghouse was in use. This suggests that the clearinghouse not only coordinates the timing of appointments but also increases the scope of the market, compared to a decentralized market with early appointments.