本研究期望透過觀察供應商企業與其供應鏈夥伴的共址關係與否以了解其與該供應商企業創新績效之間的關聯，以及共址區域的相似產業溢出程度將如何調節兩者之間的關係。本研究以美國為例，以混合估計模型 分析自 1989 年至 2017 年期間美國境內的技術密集型企業數據，其中包含了837間各自獨立的供應商、1335個供應商-客户配對以及4個產業類別。研究結果顯示，部分產業的共址關係確實會對供應商企業的創新績效產生積極的影響。除此之外，共址區域的相似產業溢出程度也會因應供應商產業的不同而對共址帶來的效益帶來不同的調節效果。

This paper aims to examine whether the decision of a supplier firm’s facilities to be co-located with its supply chain partners brings positive effects to the supplier firm's innovation performance, and how the geographic spillover resulted from the co-location decision moderates this relation. Take the U.S. as an example. Using pooled regressions, we collect data from 837 US-based technology-intensive firms (which give us 1,335 supplier-buyer pairs), classify these firms into four industry categories, and analyze their innovation performance from 1989 to 2017. Our empirical results show that co-location for some industries indeed are positive associated with the innovation performance of supplier firms. However, geographic spillover in the co-located areas also moderates the benefits of co-location differently depending on the supplier's industry.

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