Feudal political economy
研究了在精英同时掌握经济与军事资源、缺乏稳定权力机构的情况下，如何通过非约束性协议形成联盟，并分析了王国统一或分裂的条件，以中世纪欧洲历史为例。
Abstract How is order achieved in a realm in which every elite commands both economic and military resources, and no stable institutions of power exist? We depict coalition formation in the feudal world as a series of non-binding agreements between elites who can move in and out of the coalition, through peaceful and violent means. We derive conditions under which the realm unites under one rule — a grand coalition, or remains fragmented. We motivate our analysis with key historical episodes in medieval Europe, from the Frankish Kingdom in the 5th to 10th centuries and England in the 11th to 15th centuries.