Turtles all the way down

Well, it’s settled. Money buys happiness. Story at 11.

The facts about income and happiness turn out to be much simpler than first realized:

1) Rich people are happier than poor people.
2) Richer countries are happier than poorer countries.
3) As countries get richer, they tend to get happier.

Moreover, each of these facts seems to suggest a roughly similar relationship between income and happiness.