Across the world, rural poverty is causing an unstoppable tide of migration to the cities.
By 2050, it's predicted that around 2 billion will live in slums.
Paul Mason, Newsnight's economics editor, visits Manila to ask a question the city fathers of the 19th century would have shuddered at: do we have to learn to live with slums? Are these vast shanty towns here for the foreseeable future? And can we, in the rich world, learn from how people in these places live?
Producer: Jo Mathys.
Paul Mason visits Manila to assess the benefits of life in the world's poorest slums.