I think it's mostly geographical area. We all have under our eyes it's not the same thing to be born in Australia or Norway and to be born in Bolivia or in North Korea. In the first case, people are perceptibly favoured. Opportunities appear. In a country whose economy is broken, where opportunities don't appear, to be born in a poor family makes people poor. No money to pay for school force people to underpaid and strenuous jobs and that carries on poverty.