"Zipf's Law (pdf) states that if you tabulate the biggest cities in a given country and rank them according to their populations, the largest city is always about twice as big as the second largest, and three times as big as the third largest, and so on. In other words, the population of a city is, to a good approximation, inversely proportional to its rank." [more inside]
posted by AceRock on May 21, 2009 - 31 comments