[repsilat]

> push some jobs elsewhere

The theory goes that these high-density population centres have higher productivity, for a couple of reasons:

- "Truer" competition -- distance is an artificial barrier that reduces employees' access to jobs and reduces employers' access to job candidates. It also reduces companies' access to each other.

- More cross-pollination as people a free to move jobs more often and (in theory) have more interactions with other companies.

There are no doubt some downsides to concentrating all of your nation's business in one place, and things like telecommuting and fast public transport will have the effect of bringing people closer together without straining infrastructure as much, but there's really no alternative to density.