We see ICT spillovers everywhere but in the econometric evidence: a reassessment
利用美国公司数据，研究ICT扩散带来的知识溢出对生产率的影响，发现行业内溢出短期为负，行业间为正，整体效应在5年后转正，吸收能力的作用随时间减弱。
Using company-level data for the US we study the productivity effects of knowledge spillovers, induced by the diffusion of ICT in the markets where companies operate. We adopt multiple spillover proxies and account for firms' absorptive capacity and lagged effects. Our results show that intra-industry ICT spillovers have a contemporaneous negative effect while the impact of inter-industry spillovers is positive. The overall productivity effect of ICT is negative, except for those companies with a strong absorptive capacity. However, after a 5-year lag the overall spillover effect turns positive while the role of absorptive capacity diminishes as a consequence of decreasing learning costs and more accessible technology.