Networks of companies and branches in Poland

In this 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 related by companies acting in both of them. To remove weak, accidental links we shall use a concept of threshold filtering for weighted networks where a link weight corresponds to a number of existing connections (common companies or branches) between a pair of nodes.Comment: 13 pages, 10 figures and 4 table

Characteristics of Real Futures Trading Networks

Futures trading is the core of futures business, and it is considered as one of the typical complex systems. To investigate the complexity of futures trading, we employ the analytical method of complex networks. First, we use real trading records from the Shanghai Futures Exchange to construct futures trading networks, in which nodes are trading participants, and two nodes have a common edge if the two corresponding investors appear simultaneously in at least one trading record as a purchaser and a seller respectively. Then, we conduct a comprehensive statistical analysis on the constructed futures trading networks. Empirical results show that the futures trading networks exhibit features such as scale-free behavior with interesting odd-even-degree divergence in low-degree regions, small-world effect, hierarchical organization, power-law betweenness distribution, disassortative mixing, and shrinkage of both the average path length and the diameter as network size increases. To the best of our knowledge, this is the first work that uses real data to study futures trading networks, and we argue that the research results can shed light on the nature of real futures business.Comment: 18 pages, 9 figures. Final version published in Physica

From production networks to geographical economics

Although standard economics textbooks are seldom interested in production networks, modern economies are more and more based upon supplier/ customer interactions. One can consider entire sectors of the economy as generalised supply chains. We will take this view in the present paper and study under which conditions local failures to produce or simply to deliver can result in avalanches of shortage and bankruptcies and in localisation of the economic activity. We will show that a large class of models exhibit scale free distributions of production and wealth among firms and that regions of high production are localised

The complex-network based relation between migration and FDI in the OECD

We explore the relationship between human migration and OECD’s Foreign Direct Investment (FDI) using a complex systems’ approach, and we demonstrate how complex systems’ techniques can contribute new insights and advance macroeconomic empirical analysis in alternative ways. More precisely, we find a strong correlation between the migration network and the outward-FDI network, and we highlight the existence of a weaker FDI relationship in pairs of countries that are more central in the migration network. Illuminating this result, we show that inward migrants coming from third-party countries which are linked (a) either to FDI-parent country or to FDI-host country or (b) both to FDI-parent and FDI-host country are FDI marring

The complex-network based relation between migration and FDI in the OECD

We explore the relationship between human migration and OECD’s Foreign Direct Investment (FDI) using a complex systems’ approach, and we demonstrate how complex systems’ techniques can contribute new insights and advance macroeconomic empirical analysis in alternative ways. More precisely, we find a strong correlation between the migration network and the outward-FDI network, and we highlight the existence of a weaker FDI relationship in pairs of countries that are more central in the migration network. Illuminating this result, we show that inward migrants coming from third-party countries which are linked (a) either to FDI-parent country or to FDI-host country or (b) both to FDI-parent and FDI-host country are FDI marring