The annual surveys Economic Freedom of the World and Index of Economic Freedom are two indices which attempt to measure the degree of economic freedom of a nation. For years, relatively boring reports have clearly shown a direct correlation between economic freedom and per capita income, growth rates, and life expectancy.
Now the main ranking in the reports have been overlayed on a world map. The results are compelling:
Comparing a map of economic freedom to nighttime satellite photos reveals that in general the citizens that live in nations which have had economic freedom for a long time, tend to enjoy a far greater degree of electrification.
Some specific examples are quite stunning:
Obviously economic freedom and electrification are not directly correlated in every case, but there's definitely something to it.
(H.T. Carpe Diem)
Note: River boats on the Nile don't count.
For a night map with political borders, Georgia Tech has a great one running through Google Maps here.