How do agglomeration economies grow cities?
Agglomeration economies are cost and productivity advantages created when firms and workers locate near one another.
Formation process and geographic mechanism
Shared suppliers serve larger markets, specialized workers match with employers and knowledge spreads through contact. Clustering within one industry is localization, while benefits shared across diverse sectors are urbanization economies. Successful clusters attract more firms and talent. Universities and transport hubs intensify knowledge and access.
Spatial outcomes, measurement and management
Beyond a point density produces high rents, congestion, pollution and labor competition. Digital communication reduces some proximity benefits, but trust, laboratories and complex services can sustain physical clusters. Policy cannot create a cluster with buildings alone; skills, institutions and markets are necessary.