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 study looks at the United States biotechnology industry as a community of practice caught between two evolutionary logics by which valuable scientific knowledge and valuable innovations are selected. We analyze the publications and patents of 116 biotechnology firms during the period...