Liu, Andrew, and Mason A. Porter. ‘Spatial Strength Centrality and the Effect of Spatial Embeddings on Network Architecture’. Physical Review E 101, no. 6 (9 June 2020): 062305. https://doi.org/10.1103/PhysRevE.101.062305.

Gurfinkel, A. J., & Rikvold, P. A. (2020). A Current-Flow Centrality With Adjustable Reach. ArXiv:2005.14356 [Physics]. http://arxiv.org/abs/2005.14356

Pastor-Escuredo, D., & Tarazona, C. (2020). Characterizing information leaders in Twitter during COVID-19 crisis. ArXiv:2005.07266 [Physics]. http://arxiv.org/abs/2005.07266

use of in-degree and out-degree centralities to measure understand the structure of network.

Node attributes and betweenness centrality.

Sociologically, this law of networks is how inequality is built in and reproduced, i.e. it takes money to make money. People gravitate to those who already have connections, power or influence which gives those people more power, connections and influence.