Cities or Suburbs?

Throughout the long history of urban development, the size of a city roughly correlated with its wealth, standard of living, and political strength. The greatest and most powerful cities were almost always the largest in population: Babylon, Rome, Alexandria, Baghdad, Delhi, London, or New York.

But bigger might no longer mean better. The most advantaged city of the future could well turn out to be a much smaller one. Cities today are expanding at an unparalleled rate when it comes to size, but wealth, power, and general well-being lag behind. With the exception of Los Angeles, New York, and Tokyo, most cities of 10 million or more are relatively poor, with a low standard of living and little strategic influence. The cities that do have influence, modern infrastructure, and relatively high per capita income, by contrast, are often wealthy small cities like Abu Dhabi or hard-charging up-and-comers such as Singapore. Their efficient, agile economies can outpace lumbering megacities financially, while also maintaining a high quality of life. With almost 5 million residents, for example, Singapore isn't at the top of the list in terms of population. But its GDP is much higher than that of larger cities like Cairo, Lagos, and Manila. Singapore boasts a per capita income of almost $50,000, one of the highest in the world, roughly the same as America's or Norway's. With one of the world's three largest ports, a zippy and safe subway system, and an impressive skyline, Singapore is easily the cleanest, most efficient big city in all of Asia. Other smaller-scaled cities like Austin, Monterrey, and Tel Aviv have enjoyed similar success.

It turns out that the rise of the megacity is by no means inevitable -- and it might not even be happening. Shlomo Angel, an adjunct professor at New York University's Wagner School, has demonstrated that as the world's urban population exploded from 1960 to 2000, the percentage living in the 100 largest megacities actually declined from nearly 30 percent to closer to 25 percent. Even the widely cited 2009 World Bank report on megacities, a staunchly pro-urban document, acknowledges that as societies become wealthier, they inevitably begin to deconcentrate, with the middle classes moving to the periphery. Urban population densities have been on the decline since the 19th century, Angel notes, as people have sought out cheaper and more appealing homes beyond city limits. In fact, despite all the "back to the city" hype of the past decade, more than 80 percent of new metropolitan growth in the United States since 2000 has been in suburbs.

And that's not such a bad thing.  

Which model makes economic sense? Which makes cultural sense? Is there a difference?