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Are cities becoming enclaves for the rich? Katy Watson reports from Sao Paolo in Brazil where occupiers have taken over vacant land in the city, and writer and activist Olutimehin Adegbeye describes slum clearance operations in the Nigerian capital Lagos. So why don't cities build more homes for poorer people? Paul Swinney from the Centre for Cities think tank in the UK discusses. Presented by Manuela Saragosa. (Photo: Grenfell Tower in London following a deadly fire in June 2017, Credit: Getty Images)