Global cities and economic growth

The number of cities with more than 10 million inhabitants will grow from 14 in 1992 to 23 in the year 2000. It seems that having a large population accounts for economic growth. This is true for megacities such as Tokyo, London, Los Angeles and Dusseldorf. However, a population of two to three million is enough to make a city globally important, as in the case of Amsterdam, Brussels and Copenhagen. Ultimately, economic development depends as much on sound policies to control poverty and other social and environmental problems as on large populations