Fig. 3
Example of hierarchical structure. a The large-scale organization of geo-industrial clusters in the labor flow network. Each circle represents a geo-industrial cluster, with size proportional to its number of employees. The colors represent the highest-level community membership. b–e Two examples of hierarchical sub-structures in the labor flow network are illustrated. Each circle represents a firm and the bar charts show the reduction in industry and region entropy within the cluster as a proportion of the parent cluster’s entropy. b, c the organization of banking and financial geo-industrial clusters are affected more by industries than geography. d, e the geo-industrial clusters in US Midwest and South region form strong geographical clusters
