This paper considers a graph model of hierarchical supply chains. The goal is to measure the complexity of links between different components of the chain. for instance. between the principal equipment manufacturer (a root node) and its suppliers (preceding supply nodes). https://www.nacrack.com/flash-choice-Netgear-Nighthawk-LTE-Mobile-Hotspot-Router-Mobile-Hotspot-LTE-BRAND-NEW-p8608-best-super/