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生产性服务业与制造业在价值链和城市空间层面的异质性影响使这两大关联产业在协同集聚过程中呈现出互补与挤出双重效应交替的特征。以协同集聚双重效应的协调度为核心构建理论假说,并基于长三角地区城市面板数据对此双重效应进行了实证检验。结果显示:存在一个均衡土地租金水平使协调度最大,而中心城市对周边其他城市的影响显著,且在任何规模下双重集聚效应对劳动生产率都有促进作用,但随着城市规模增加也呈现倒U型趋势。因此,必须以互补效应最大化、挤出效应最小化为宗旨,推进产业集聚与城市化之间的层级转换,实现价值链与空间链的链式协同和涓滴效应。
The heterogeneous influence of producer services and manufacturing in the value chain and urban space makes the two related industries show the double effect of complementarity and extrusion in the process of synergy. The theoretical hypothesis is constructed based on the coordination degree of synergetic dual effect, and the double effect is tested empirically based on the urban panel data in the Yangtze River Delta. The results show that there is an equilibrium land rent level that maximizes coordination while central cities have significant impact on other surrounding cities and that dual agglomeration effects have a positive effect on labor productivity at any scale, but also fall as the size of the city increases U-shaped trend. Therefore, it is necessary to maximize the complementary effect and minimize the extrusion effect, and promote the hierarchical transition between industrial agglomeration and urbanization to achieve the chain synergy and trickle-down effect between the value chain and the space chain.