Structural Transformation of Minimal Spanning Trees in World Commodity Market
J. W. Lee, Ashadun Nobi · Acta Physica Polonica A · 2018
We consider structural change of a world trade-ow network for dierent commodities from 1995 to 2013.A minimum spanning tree is generated from the trade ow data, and we investigate the hierarchical organization of the tree by changing the hub node.Only a few countries are the hub nodes for many of the commodities.We observed the structural transitions, from a chain-like tree (many countries are hub nodes) to a bi-starlike tree (only two countries are hub nodes).In the bi-starlike tree, China and Germany are the only two hub nodes.