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Linked: How Everything Is Connected to Everything Else and What It Means for Business, Science, and Everyday Life
amazon.com

Putting the pieces of the puzzle together, we find that real networks are governed by two laws: growth and preferential attachment.
Jennifer Frangos • Linked: How Everything Is Connected to Everything Else and What It Means for Business, Science, and Everyday Life
The fancy term for this is preferential attachment, defined as: “the more connected a node is, the more likely it is to receive new links.”
Andrew Chen • The Cold Start Problem: How to Start and Scale Network Effects
Scale: The Universal Laws of Life, Growth, and Death in Organisms, Cities, and Companies
amazon.com

as cities grow and their networks evolve, the area or volume of the networks needed to keep them functionally connected tends to become smaller on a per capita basis. For example, in larger cities more people can share the same bus or segment of road or sewer pipe.