Difficult to answer question, without doing extensive research. But I'll try to answer just from personal experience visiting these places. I'm from the Netherlands. Here people are considered to have a high standard of living. read more
Here people are considered to have a high standard of living. So this will be my reference point, leaving scientific research and data out of the picture. I also visited or lived in some countries with a lower standard of living like China, Sri Lanka, Burkina Faso, Zambia, Ghana, Cuba and Mexico. read more