城市网络发育特征及其对城市竞争力的影响--基于珠三角主要金融行业148家企业选址数据

新城市主义的城市网络作为城市关系研究的新范式越来越受到关注。基于珠三角主要金融行业148家企业选址数据，借鉴城市联锁网络模型，实证分析城市网络发育特征及其形成的行业动因，进而探讨了城市网络外部性对城市竞争力的影响。研究结果表明，珠三角城市群已初步形成以“深圳-广州”为核心的“核心-边缘”网络层级结构。保险业较之于银行业和证券业对于城市网络具有更大的贡献弹性。城市链接率与城市竞争力的弹性分析表明，城市网络外部性对城市竞争力提升具有明显的正向促进作用。

Development Characteristics of City Network and Its Influence on Urban Competitiveness---Based on Location Data of 148 Major Financial Firms on Pearl River Delta

Researches on city network receive more and more attention as a new research paradigm on re-lationship between cities. Based on the location information of 148 main financial enterprises,this paper analy-zes the city network structure of the Pearl River Delta（ PRD）,and then discusses the relationship between the city network externalities and city competitiveness. Results show that the PRD urban agglomeration has initially formed a core-periphery network hierarchy structure with Shenzhen-Guangzhou as the center. According to the degree of connection rate and contact strength of city nodes,the core subnet consists of 5 city nodes,and can be divided into three level of network connections,while the periphery subnet consists of 4 city nodes,and can be divided into two level of network connection. From the analysis on financial industries,their contribu-tion degree on the formation of urban network reduces as the following order：insurance,banking and securi-ties. The elasticity analysis shows that the formation of urban network has significant effects on the city devel-opment,reflecting in the city network externality has a relatively remarkable positive effect in promoting city competitiveness.