Key points
- Castells read urban movements as structural responses to power, not isolated reactions.
- Contemporary cities are not closed entities but nodes in global networks of information and capital.
- In the informational economy, knowledge becomes the system's primary resource.
Manuel Castells, a Spanish sociologist born in 1942, is one of the most influential figures in the study of cities, urban social movements and the relationship between technology and urban life. The Urban Question (1972) marked a turning point in the critical analysis of urban space by proposing a new way of understanding cities and their conflicts; later, with The Information Age, he carried that perspective into the network society. This journey runs from the neighbourhood in struggle to the network city.
Urban social movements
His first major contribution is the study of urban social movements, culminating in The City and the Grassroots (1983). Against approaches that saw them as isolated or passing reactions, Castells read them as structural responses to power relations in the city: they arise against living conditions imposed by urban capitalism, in which housing, access to services and the distribution of space are decided by economic interests rather than people's needs. These movements do not only demand better material conditions: they question how the city is organised and governed.
From protest to the network city
In his later work, Castells explains how globalisation and information technologies have reconfigured cities. Far from being autonomous, closed entities, contemporary cities are interconnected by global networks of information, capital and people: what he calls the space of flows, as opposed to the space of places. That connectivity circulates information and resources at world scale, and at the same time sharpens the inequality between those with access to the networks and those left outside. Cities are nodes of the global network, and they prosper or sink according to their integration into it.
Another central theme is the informational economy, developed in the trilogy The Information Age (1996–1998). New technologies have transformed the economic structure: knowledge and information are now the main resources of the global economy. That has direct consequences for urbanism: cities that adapt become centres of innovation and prosperity, and those that do not are left on the margins. Castells warns that technology is not neutral and that its introduction into the city must be accompanied by policies that promote equity and universal access.
Social interaction transformed
Castells has also examined how technology changes social interaction in cities. With digital networks woven into urban life, people connect and interact in virtual spaces, and that transforms social dynamics and civic participation. In Networks of Outrage and Hope (2012) he studies the movements that use information technologies to mobilise large groups and coordinate protests on a global scale. The network city enables new forms of solidarity and collective action, and at the same time raises challenges of privacy and control over information.
Castells's contributions changed the way cities are understood: not only physical places but social and economic spaces run through by global information networks. His analysis of the informational economy and of urban movements leaves an open question for the cities to come: how to adapt to these transformations without the connection of some being paid for by the exclusion of others.
Frequently asked questions
What are urban social movements according to Castells?
Structural responses to power dynamics within the city rather than isolated or temporary reactions: conflicts over services, housing and space that are fully political in nature.
What is the network city?
The idea that contemporary cities are not autonomous, closed entities but are increasingly interconnected through global networks of information, capital and people, which transforms how they work internally.
