“…A body of work has been directed to analyzing the means of appropriation, in particular, the role of mobility, of face to face contacts and more recently to the study of networks (social, scientific, technological, etc.) as witnessed by the special issues of Papers in Regional Science (2007) and Annals of Regional Science (2009). Alongside this, the study of sources likely to generate knowledge flows has given birth to a corpus of work studying diverse sources of externalities, e.g., public/private research programs, intra/inter‐sectoral, and pecuniary versus pure knowledge externalities (Autant‐Bernard et al, 2010).…”