that is because having moller when you don't have the basic necessities of life is important. it makes less and less difference for the measures of life for human beings parker you know, if you look at the measures of well-being over time in a country may be average levels double or triple imagine a flat line. we are the first generation to get to what economic growth can do for us. that is a really important point* to understand. after hundreds of years the best way to raise the quality of life is to raise material living standards. particularly when we understand the environmental damage. of course, we all want more money. but that has to do with status competition. economic growth is a zero sum game and the rich developed world. at any rate, kate and i will talk about inequality. we don't use any hypothetical data but simply looking at levels of the differences of the quality. the measure reuse is how much richer the top 20% compared to the poorest 20%. you can see in the most people countries, four times as rich's the scale of the income gap with top 20% in each of the cou