Let’s see. We start the world, eh? This is all UN statistics that have been available. Here we go. Can you see there? It’s China there, moving against better health there, improving there. All the green Latin American countries are moving towards smaller families. Your yellow ones here are the Arabic countries, and they get longer life, but not larger families. The Africans are the green here. They still remain here. This is India; Indonesia is moving on pretty fast.

So let’s move over to another way here in which we could display the distribution in the world of income. This is the world distribution of income of people. One dollar, 10 dollars or 100 dollars per day. There’s no gap between rich and poor any longer. This is a myth. There’s a little hump here. But there are people all the way. And if we look where the income ends up, this is 100 percent of the world’s annual income. And the richest 20 percent, they take out of that about 74 percent. And the poorest 20 percent, they take about two percent. And this shows that the concept of developing countries is extremely doubtful. We think about aid, like these people here giving aid to these people here. But in the middle, we have most of the world population, and they have now 24 percent of the income.

https://www.ted.com/talks/hans_rosling_the_best_stats_you_ve_ever_seen