GEOGRAPHIC CONCENTRATION AND ESTABLISHMENT SCALE: AN EXTENSION USING PANEL DATA*
利用爱尔兰制造业近三十年的工厂级面板数据，验证了工厂规模与当地产业集中度之间的正相关关系，并发现控制固定效应会削弱这种关系，且新设工厂的关联较弱，但随存续时间增强。
ABSTRACT In a recent study, Holmes and Stevens (2002) identify for the first time the positive relationship that exists between establishment scale and local industry concentration using a large cross‐sectional plant‐level data set for the United States. Using an exhaustive plant‐level panel data set for Irish manufacturing covering nearly three decades, we are able to extend their analysis in two ways. First, we show that failing to control for fixed effects biases the relationship upward, although the essence of the result still remains after fixed effects are included. Second, the link is substantially weaker when plants locate for the first time in an area, but strengthens with age for those that survive in the long run. We link our results to recent contributions on the dynamics of geographic concentration.