Network models provide a general representation of inter-connected system dynamics. This ability to connect systems has led to a proliferation of network models for economic productivity analysis. primarily estimated non-parametrically using Data Envelopment Analysis (DEA). While network DEA models can be used to measure system performance. https://www.spidertattooz.com/SNS-Dipping-Powder-Trendy-Grey-1-oz-NOS21-p35616/