New York University (NYU) professor Scott Galloway recently issued a stark warning: income inequality is out of control in the US and could even spark a revolution. America is notorious for its wide economic disparities, but how do other nations measure up? And is the gap between the haves and have-nots narrowing anywhere?

Read on to discover the income disparities in 39 selected countries based on the World Bank Gini index, a measure of how income is distributed in each nation that provides a handy way of comparing levels of inequality worldwide. 

All dollar amounts in US dollars.