The localization of knowledge flows has been attributed to agglomerations of knowledge-intensive firms in a region, but I argue that knowledge localization is not consistent with the wider social and professional networks of the firms' employees. I predict that small, knowledge-intensive firms...

This paper takes a close look at the reasons, procedures, and results of cluster identification methods. Despite being a popular research topic in strategy, economics, and sociology, geographic clusters are often studied with little consideration given to the underlying economic activities, the...