Common Power Laws for City Sizes
in Hierarchical 3-Voronoi Partitions in 6 countries
United States
France
Germany
Japan
China
India
10
4
10
5
10
6
10
7
1
10
10
2
10
3
10
4
Layer-1 region ( =Country )
3 layer-2 regions
9 layer-3 regions
27 layer-4 regions
All layers