Working in inner-city Johannesburg, Simone argues that where pipes, grids and formal institutions are absent or broken, the infrastructure of the city is constituted by people themselves - the provisional, improvised collaborations among traders, migrants, hustlers, transporters and tenants. These conjunctions of bodies, objects, places and practices are flexible and endlessly recombined, producing supply chains, credit, security and shelter out of intersecting fragments rather than fixed systems. He insists this is not a deficit or a survival remainder but a distinct and generative urban form with its own competence and economy. The essay refuses to read African cities as failed approximations of Northern ones.
It shifted African and Southern urbanism from a language of lack to one of capacity, becoming one of the most cited propositions in twenty-first-century urban studies and seeding the whole 'social infrastructure' and infrastructural-turn literature. For practice it argues that upgrading which erases informal networks can destroy the very systems residents depend on, pushing planners toward supporting existing arrangements rather than replacing them.
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