An analysis of the just-released municipal population trends shows that core city growth is centered in the municipalities that have the largest percentage of their population living in suburban (or exurban) neighborhoods.
Improved Urban Core Analysis
There is considerable interest in urban core population trends, both because of recent increases in the interest of urban planning orthodoxy to restore living patterns more akin to the pre-World War II era. At that time, urban areas were considerably more densely populated, commuting travel was much more focused on downtowns (central business districts or CBDs) and automobile use accounted for far less of urban travel than today.
Image: http://commons.wikimedia.org/wiki/File:San_Jose_California_aerial_view_south.jpg