Romer on Urban Growth

Here’s one bit from an excellent interview of Paul Romer on urban development:

Q. How are economics and planning and development of cities related each other?

Urban Expansion is an exception to the usual rule that an economy does not need a plan. Creating new built urban area requires a plan for the public space that will be used for mobility (sidewalks, bus lanes, bike lanes, auto lanes …) and for parks. At a minimum, this plan should provide for a network of arteries big enough to allow bus travel and dense enough that no location is more than 0.5 km from such an artery. This is the only thing that needs to be planned up front for land that is not yet developed. Everything else can wait. But if informal development comes first, it is too late. The area will never have enough public space to allow successful urban development.

I think Romer is correct. What surprised me most when studying Gurgaon in India was that despite strong demand, there wasn’t a lot of common infrastructure being built. The transaction costs of ex-post planning were simply too high.

In addition to transport arteries, I would also mention the importance of setting aside space and access points for sewage, electricity, and information arteries. It’s not even necessary that government provide these services or even the plan itself (private planning of large urban areas is also possible) but a plan has to be made. By reserving space for services in advance of development, developers and residents can greatly improve coordination and maximize the value of a city.

A simple, minimal urban plan is analogous to the rules of the game.


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