Manhattan, the city’s wealthiest and most gentrified borough, is an extreme example. Inequality here rivals parts of sub-Saharan Africa. Last year the wealthiest 20 percent of Manhattan residents made $391,022 a year on average, according to census data. The poorest 20 percent made $9,681.
All told, Manhattan’s richest fifth made 40 times more money than its poorest fifth, up from 38 times in 2010. Only a handful of developing countries - such as Namibia and Sierra Leone - have higher inequality rates.