Rio de Janeiro
Rio has more people living in slums than any other city in Brazil, according to the 2010 Census. More than 1,500,000 people live in its 763 favelas, 22% of Rio's total population. São Paulo, the largest city in Brazil, has more favelas (1,020) in sheer numbers, but proportionally has fewer people living in favelas than Rio.
Rio de Janeiro
Rio de Janeiro has the second largest municipal GDP in the country, and 30th largest in the world in 2008, estimated at about R$343 billion (IBGE, 2008) (nearly US$201 billion). It is headquarters to Brazilian oil, mining, and telecommunications companies, including two of the country's major corporations – Petrobras and Vale – and Latin America's largest telemedia conglomerate, Grupo Globo. The home of many universities and institutes, it is the second-largest center of research and development in Brazil, accounting for 17% of national scientific output according to 2005 data. Despite the high perception of crime, the city has a lower incidence of crime than Northeast Brazil, but it is far more criminalized than the south region of Brazil, which is considered the safest in the country.