Assesses the theories of knowledge spillover and growth proposed by Romer, Porter, and Jacobs by focusing on the largest industries in 170 U.S. cities. While the theories of Romer and Porter both emphasize spillovers within an industry, Romer predicts that a local monopoly is better for growth...

Recent theories of economic growth, including Romer (1986), Porter (1989) and Jacobs (1969), have stressed the role of technological spillovers in generating growth. Because such knowledge spillovers are particularly effective in cities, where communication between people is more extensive, data...

Recent theories of economic growth, including Romer (1986), Porter (1989) and Jacobs (1969), have stressed the role of technological spillovers in generating growth. Because such knowledge spillovers are particularly effective in cities, where communication between people is more extensive, data...