Why are global cities important?
A global city densely connects finance, management, information, culture and transport networks in the world economy.
Formation process and geographic mechanism
Multinational headquarters, specialist services, exchanges, universities, media and international airports accelerate decision flows. Importance does not come from population alone; a smaller city may lead particular networks. Global functions reshape local labor and land values, expanding both high-skill and low-wage service work.
Spatial outcomes, measurement and management
Connectivity creates opportunity but may produce income polarization, expensive housing and exclusion. Global shocks spread rapidly through finance, tourism and supply networks. Rankings select different indicators, so no single definitive list exists. Local welfare also requires measures of housing, environment and service distribution.