Network structure of inter-industry flows
  We study the structure of inter-industry relationships using networks of money flows between industries in 20 national economies. We find these networks vary around a typical structure characterized by a Weibull link weight distribution, exponential industry size distribution, and a common community structure. The community structure is hierarchical, with the top level of the hierarchy comprising five industry communities: food industries, chemical industries, manufacturing industries, service industries, and extraction industries. 
James McNerney, Brian D. Fath, and Gerald Silverberg
physics.soc-ph cs.SI q-fin.GN