“…The main characteristics of today's cities are mobility and connection (Shen & Gu, 2009), and the city network structure has gradually become an important form of regional and even national spatial organization. The academic community has studied city networks for a long time, and relevant research mainly involves “enterprise associations” (Dong & Zhen, 2013; Wu & Ning, 2012; Ye, Cao, Wang, & Wu, 2017; Zhuang, Yang, Jin, & Han, 2017), “traffic links” (Derudder & Witlox, 2005; Jin, 2001; Ke, 2015; Ke, Chen, & Yu, 2017; Zhang, Hao, Ji, & Liu, 2019), and “information link” (Cao, Zeng, & Ye, 2019; Jiang, Sun, & Ren, 2015; Tranos & Gillespie, 2009; Zhen, Wang, & Chen, 2012). As the most important entities in the economy, enterprises can expand their scale through mergers and acquisitions and self‐investment in order to achieve economies of scale.…”