Choice or competition: Does integration benefit everyone?
研究了匹配市场整合对参与者的影响，发现任何“好”机制都无法保证无人因整合受损，并给出了使单调性与其他理想性质兼容的条件。
Matching markets are often fragmented, organized at a small local level. While integration of matching markets may lead to welfare gains by expanding choice, it may also harm some market participants by increasing competition for the same resources. We show that every “good” mechanism fails the monotonicity requirement that no individuals be hurt by integration. Then we provide characterization results that identify conditions under which monotonicity becomes compatible with other desirable properties of matching mechanisms.