"Localities in developed countries often restrict construction and population growth through regulations governing land usage, lot sizes, building heights, and frontage requirements. In developing countries, such policies are less effective because of the existence of unregulated, informal...

"The share of metropolitan residents living in central cities declined dramatically from 1950 to 2000. We show that, if not for a series of demographic factors - notably renewed immigration, delayed child bearing, and a decline in the share of households headed by veterans, who are eligible for...