基于空间知识溢出的经济增长模型

Economic Growth Model Based on Spatial Knowledge Spillover

以Romer新经济增长理论为基础,建立了创新部门的空间知识溢出、产业集聚的经济增长模型,从一个新视角研究了集聚和溢出对区域经济增长的影响和作用机制.研究表明,当知识溢出效应全局化时,人均产出增长率与创新部门的空间分布没有关系;当知识溢出效应局域化时,创新部门分布占优势的区域随着集聚度和知识溢出的增加,人均产出增长率提高,而创新部门分布不占优势的区域,人均产出增长率下降,但由于知识溢出产生的反向作用力将减缓人均产出增长率的下降速度.

Knowledge spillover and innovation agglomeration play important roles in regional economic growth. Based on the new theory of economic growth by Romer, an economic growth model is developed for the spatial knowledge spillover in relation to industrial agglomeration of innovation. The effects of both agglomeration and knowledge spillover on regional economic growth are thus studied in a new perspective. It is revealed that when globalizing the knowledge spillover, the per capita output growth rate bears no relation to the spatial distribution of innovation sectors. When localizing it, however, in the region where the innovation sectors are dominant in its industrial distribution the per capita output grows with increasing knowledge spillover and agglomeration but, if the innovation sectors are not dominant, the per capita output growth rate will drop off at a speed that is slowed down due to the resilience of knowledge spillover.