> The infrastructure necessary to build suburbs is expensive I'm not sure it's so simple. Yes, a mile of underground services (water, sewer, etc) in NYC serves

> The infrastructure necessary to build suburbs is expensive I'm not sure it's so simple. Yes, a mile of underground services (water, sewer, etc) in NYC serves orders of magnitude more people than a mile of underground services in some suburb. But, digging up a mile of underground services in NYC also costs billions of dollars, whereas a similar dig out in the suburbs can be done by a few people and a small digger in far less time and doesn't cost much because there's nothing near or above it.