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本文结合DAG和Granger技术,采用2000—2007年代表性城市A股上市公司的季报数据为样本,刻画市级产业聚集内多个企业之间的外溢效应。研究表明:多企业之间存在同期正向外溢效应和滞后的负向外溢效应;聚集缓解了“挤占”效应;正向外溢效应的所有权特征和产业特征显著,而“挤占”效应的这两项特征不显著;网状或链型的外溢效应路径产生放大或传递效应。通过本研究还得以挖掘出聚集区域内的溢出中心和吸收中心,为核心企业的培育提供经验支持。
Based on the DAG and Granger techniques, this paper uses the quarterly data of A-share listed companies from 2000 to 2007 as a sample to illustrate the spillover effects among multiple firms in municipal industries. The research shows that there are positive spillover effects and lagged negative spillover effects among multiple firms; agglomeration mitigates “crowd squeeze ” effect; positive spillovers have significant ownership and industry characteristics, while “crowding out ” effect Of these two characteristics is not significant; mesh or chain-type spillover effect of amplification path or transmission effect. Through this study, we can also dig out the overflow center and absorption center in the gathering area to provide empirical support for the cultivation of core enterprises.