Global cities play a central role in the processes of globalization as centers of global operations where the effects of these activities are most visible. They are primary nodes in the global economic network and are characterized by concentrations of wealth, growing disconnection from their regions, and large marginalized populations. Global cities act as hubs for international finance, trade, media and innovation and have high percentages of residents employed in services and information sectors. Increased globalization has led to centralization of production in urban centers, driving increases in global cities despite criticisms that they neglect domestic economies and cities within nations.