The current observation is that the urban poor are moving to the suburbs. Alon Levy says that this is nothing new, and the current effects of such movement is in fact just the "tipping point" of what's been happening for the last 50 years.
Oct 2, 2011 Pedestrian Observations
Housing in the urban core of Washington D.C. is expected to grow in coming years as demand for it increases.
Apr 14, 2011 The Washington Examiner
Aaron Renn, The Urbanophile, argues that the stats actually show that cities are losing people in their urban cores, not gaining them.
Apr 4, 2010 New Geography
Toronto is swimming in high-rise construction, with the second highest rate in the world. Some say this shift to the urban core spells the end of sprawl in Toronto.
Sep 19, 2008 Globe and Mail
A recent study shows that about 60% of all trips into the urban core of Vancouver are not by car.
Sep 8, 2008 The Vancouver Sun