“层层加码”与城市创新——基于省市两级经济增长目标差异的实证分析

“Layer upon Layer”and Urban Innovation:An Empirical Analysis Based on the Differences of Economic Growth Targets at Provincial and Municipal Levels

城市创新是国家创新发展的基础。基于我国城市经济增长目标与省级经济增长目标的差异,实证检验经济增长目标的“层层加码”对城市创新的影响。研究发现,“层层加码”显著抑制了城市创新;中介机制分析表明,“层层加码”会通过促进扩张性投资与挤出政府科教支出,抑制城市创新水平提升;微观机制分析表明,“层层加码”抑制了企业研发投入与专利产出,不利于企业创新水平提升;异质性分析表明,随着城市创新水平提升,“层层加码”对城市创新的抑制作用呈现出先增强后减弱的“V型”变化特征,且“层层加码”对省会城市与副省级城市创新水平的抑制作用强于其他城市。

Based on the theoretical analysis and the difference between urban economic growth goals and provincial economic growth goals,this paper empirically tests the impact of“layer upon layer”of economic growth goals on urban innovation.It is found that the“layer upon layer”significantly inhibits urban innovation;The analysis of intermediary mechanism shows that“layer upon layer”will inhibit the improvement of urban innovation level by promoting expansionary investment and crowding out government expenditure on science and education;The micro mechanism analysis shows that the“layer upon layer”inhibits the R&D investment and patent output,which is not conducive to the improvement of enterprise innovation level;Heterogeneity analysis shows that with the improvement of urban innovation level,the inhibition effect of“layer upon layer”on urban innovation shows a“V-shaped”change feature,which first increases and then decreases,and the inhibition effect of“layer upon layer”on the innovation level of provincial capital cities and vice provincial cities is stronger than that of other cities.