Urban Growth and Decline: The Role of Population Density at the City Core
http://www.clevelandfed.org/research/commentary/2011/2011-27.pdf
Examines four decades of Census data and population changes in 180 metropolitan areas; concludes that growing cities maintain dense urban centers, while shrinking cities do not. Links loss of population density at the city core or central business district to loss of productivity. From the Federal Reserve Bank of Cleveland
