Getting richer doesn't make you happier above the average income. Chronic health problems make you unhappy. Unemployment makes you unhappy. Divorce makes you unhappy. These are strong findings from across the rich countries of the world.
Carol Graham, in Happiness Around the World, added her own study of Latin America, Russia, and Afghanistan, and collected other studies of sub-Saharan Africa. The result: the same relationships hold in middle-income and poor countries, too.
The happiest people were sub-Saharan Africans, among the poorest people on earth. Their absolute wealth is low, but personal happiness is tied more to having enough to live, and then having good family and friend relationships.