中文摘要：

建立一个包含城市拥挤成本的非对称新经济地理学模型，分别从工人、地方政府和中央政府的视角，分析区域一体化的福利效应。研究发现：区域一体化有助于社会总体福利改善，但对不同经济主体的影响不同；区域一体化总体可以改善熟练工人的福利，但对不可流动工人的影响则取决于其区位。地方政府对区域一体化的偏好取决于其政策目标，若其目标是在“晋升锦标赛”中获胜，则总有地区倾向于市场分割策略；而以本地居民福利最大化为目标时，则两地区有机会通过区域一体化实现共赢。中央政府需要权衡效率和公平之间的关系，在通过区域一体化水平提高经济系统整体效率的同时。也必然会经历一个区域发展差距扩大的阵痛期，需要采取转移支付等措施来缓解区域差距过大带来的负面影响。

英文摘要：

This paper establishes a model of asymmetric new economic geography containing city congestion costs, from the perspective of workers, local government and central government, and analyzes the welfare effects of regional integration. Regional integration can improve overall wel- fare, but the impacts on different economic agents are different. Regional integration can always improve the welfare of migrant workers, but the impact on non-mobile workers depends on their lo- cation. The manner of Local government to integration depends on their preferences of policy objec- tives. If its goal is to ＂winning promotion tournament＂, local government prefer market segmenta- tion strategy; while if the goal is maximizing welfare of residents, local government will follow a win-win strategy of integration. Central government must make a trade-off between efficiency and overall regional development disparities. Regional integration can not only increase the overall welfare of society, but also the expansion of regional disparities. The central government should reduce regional disparities through transfer payments.