“…This line of reasoning is consistent with Puga's (2010) questions concerning the nature of agglomeration economies: whereas static agglomeration externalities (linked to the division of labour, to shared infrastructure and to labour availability) have been well documented empirically, dynamic externalities-and in particular the connection between diversity of larger cities and firm-level learning-have not been observed so unequivocally (Fitjar & Rodríguez-Pose, 2017). Once collaboration or information exchanges are established (which often requires face-to-face-Bathelt, 2011), they can be maintained at a distance (Macpherson, 2008): indeed, external contacts are particularly important in small towns and rural settings because without outside information and knowledge there is danger of lock-in (Boschma, 2005), as smaller groups of people more quickly share their ideas and tend towards homogeneity (Fuijta, 2009). Once collaboration or information exchanges are established (which often requires face-to-face-Bathelt, 2011), they can be maintained at a distance (Macpherson, 2008): indeed, external contacts are particularly important in small towns and rural settings because without outside information and knowledge there is danger of lock-in (Boschma, 2005), as smaller groups of people more quickly share their ideas and tend towards homogeneity (Fuijta, 2009).…”