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School
Department
Course
Megacities
What are megacities?
What is different between large cities compared with a smaller one?
Some say megacities are sustainable. Less energy, garbage waste per capita
Others use dystopia to disapprove
Why are megacities important?
Megacities contain 9% of the world population
Rapid growth of number of megacities, 2 in 1950, in 2007 there are 19
By 2050, projected there will be 27 megacities
What are megacities?
Population > 10 million
In the past, the definition was once 4 million, then 8 million
No reason to think that there isnt a qualitative change from 8 or 10 million
But there is difference between 1 or 10 million
What kind of urban issues are influenced by very large cities?
- Resources demanded
- Scaling the city, transportation
- Pollution
- Governance
Special issues of very large cities
History of thinking about city size
Plato thought 50000 is the ideal size, any size larger, people wont know each other
At 50000, it is possible for everyone to know each other and get involved politically
In 20th century, when a city goes over a certain level, diseconomies of scale would
dominate. Increase cost, reduce efficiency, leading to slower growth
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Document Summary

 megacities contain 9% of the world population.  rapid growth of number of megacities, 2 in 1950, in 2007 there are 19.  by 2050, projected there will be 27 megacities. In the past, the definition was once 4 million, then 8 million.  no reason to think that there isn"t a qualitative change from 8 or 10 million.  but there is difference between 1 or 10 million.  plato thought 50000 is the ideal size, any size larger, people won"t know each other.  at 50000, it is possible for everyone to know each other and get involved politically. In 20th century, when a city goes over a certain level, diseconomies of scale would dominate. Increase cost, reduce efficiency, leading to slower growth www. notesolution. com.  diseconomies of scale is impossible to tell.  all of the factors are expected to grow with city size. Increase business cost, reduce infrastructure investment, roads, etc.

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