本研究旨在瞭解城市產業於各階段產業生命週期之聚集動態外部性的變化。以民國70年至90年之年度工商普查資料為基礎資料，實證對象為台灣地區25個中分類製造業，空間單元定義為21個都市區域。於每資料年度分別確認各類產業所處之生命週期階段，並將資料整理成為以「城市-產業」為橫斷面分類的追蹤資料型態(Panel data)，採取修改自Neffke et al. (2011) 之實證方法，利用Cobb- Douglas 生產函數建立迴歸實證模型，以隨機效果及固定效果模型測試各階段產業生命週期的外部動態效果影響。主要測試之標的為文獻所重視的三種動態聚集外部性( MAR外部性、Jacobs外部性及Porter競爭外部性)之影響。
結果發現，總合製造業存在著顯著的Jacobs外部性，MAR外部性則無顯著的影響而Porter外部性則對產業發展有負面的影響。聚集外部性隨著產業生命週期演進而有所差異，初始階段之產業存在著顯著的MAR與Jacobs外部性，中間與成熟階段之產業則存在著顯著且積極的Jacobs外部性、Porter外部性則為負面的。

This research aims to understand the changing roles of agglomeration externalities along the industry life cycle in different stages. The objects of study are the data between 1981 and 2001 of 25 Taiwan’s manufacturing industries based on the Industry, Commerce and Service Census. It is identified for each year when the different types of industries are in a young, intermediate, or mature stage. The main subject of this research is test for the impact from three dynamic of agglomeration externalities, such as MAR, Jacobs and Porter’s externalities. The results reveal few points as follow. First, for all industries, there is a significant impact of Jacob’s externalities. Second, for young industries, there is a significant impact of Jacob’s and MAR externalities. Most important of all, for mature industries, there is a significant impact of Jacob’s externalities, but Porter’s externalities are negative impact and none of MAR externalities.

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