Weighted Networks at the Polish Market
During the last few years various models of networks [1,2] have become a powerful tool for analysis of complex systems in such distant fields as Internet , biology , social groups , ecology  and public transport . Modeling behavior of economical agents is a challenging issue that has also been studied from a network point of view. The examples of such studies are models of financial networks , supply chains [9, 10], production networks , investment networks  or collective bank bankrupcies [13, 14]. Relations between different companies have been already analyzed using several methods: as networks of shareholders , networks of correlations between stock prices  or networks of board directors . In several cases scaling laws for network characteristics have been observed.
KeywordsBipartite Graph Degree Distribution Physical Review Node Degree Production Network
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