Suburbs aren't intrinsically cheaper than cities. In places where suburban living isn't massively subsidized by urban taxes, it's far cheaper to live in a city.

Suburbs aren't intrinsically cheaper than cities. In places where suburban living isn't massively subsidized by urban taxes, it's far cheaper to live in a city. Just look at the urbanization rates in countries with poor/ineffective central governments. Poor people wouldn't be migrating to cities en masse unless they had a damn good economic reason for doing so.