Using the concept of network, three kinds of firms' networks can be distinguished according to the kind and the level of interdependence between firms, namely Marshallian districts, complementary networks and cooperative networks. Some of them are horizontal and information oriented, others are polarized and hierarchic.
SALLEZ, A. (1994). Réseaux d'entreprises. In: Encyclopédie d'Economie Spatiale. Concepts - Comportements - Organisations. 1st ed. Economica, pp. 315-324.