We consider school choice problems (Abdulkadiroğlu and Sönmez, 2003) where students are assigned to public schools through a centralized assignment mechanism. We study the family of so-called rank-priority mechanisms, each of which is induced by an order of rank-priority pairs. Following the corresponding order of pairs, at each step a rank-priority mechanism considers a rank-priority pair and matches an available student to an unfilled school if the student and the school rank and prioritize each other in accordance with the rank-priority pair. The Boston or immediate acceptance mechanism is a particular rank-priority mechanism. Our first main result is a characterization of the subfamily of rank-priority mechanisms that Nash implement the set of stable (i.e., fair) matchings (Theorem 1). We show that our characterization also holds for "sub-implementation" and "sup-implementation" (Corollaries 3 and 4). Our second main result is a strong impossibility result: under incomplete information, no rank-priority mechanism implements the set of stable matchings (Theorem 2).
|Original language||English (US)|
|Number of pages||30|
|State||Published - 2017|
|Name||Barcelona GSE Working Papers Series|
Jaramillo, P., Kayi, C., & Klijn, F. (2017). School Choice: Nash Implementation of Stable Matchings through Rank-Priority Mechanisms. (Barcelona GSE Working Papers Series; No. 957). http://www.barcelonagse.eu/research/working-papers/school-choice-nash-implementation-stable-matchings-through-rank-priority