Just a few metro areas represent nearly all national GDP growth
[Just] 64 metro areas. . . . collectively contribute about 62 percent of the combined GDP of Canada and the U.S. Between 2010 and 2011 they represented 83 percent of the growth in the combined GDP.
More evidence for Richard Florida's assertion that the world is spiky, not flat...
http://isites.harvard.edu/fs/docs/icb.topic30774.files/2-2_Florida.pdf
