Chmiel, Anna M.; Sienkiewicz, Julian; Suchecki, Krzysztof; … - In: Physica A: Statistical Mechanics and its Applications 383 (2007) 1, pp. 134-138
In the present study we consider relations between companies in Poland taking into account common branches they belong to. It is clear that companies belonging to the same branch compete for similar customers, so the market induces correlations between them. On the other hand two branches can be...
