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There is virtually no way to have a city the size of Sao Paulo and not have "favelas", or something equivalent. Most people in Europe and the US/Canada would have a hard time grasping the idea of 35-40 million people being in such close proximity to one another.
(Land planning is so tight in Japan that they have probably had to do a good job with Tokyo, but that's about the only example I can think of.)
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