A $300 idea that is priceless

Friedrich Engles said in “The Condition of the Working Class in England”, in 1844, that the onward march of Manchester’s slums meant that the city’s Angel Meadow district might better be described as “Hell upon Earth”. Today, similar earthly infernos can be found all over the emerging world: from Brazil’s favelas to Africa’s shanties. In 2010 the United Nations calculated that there were about 827m people living in slums—almost as many people as were living on the planet in Engels’s time—and predicted that the number might double by 2030.

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