World Happiness Report 2016
This year, for the first time, the World Happiness Report gives a special role to the measurement and consequences of inequality in the distribution of well-being among countries and regions. In previous reports the editors have argued that happiness provides a better indicator of human welfare than do income, poverty, education, health and good government measured separately. In a parallel way, they now argue that the inequality of well-being provides a broader measure of inequality. They find that people are happier living in societies where there is less inequality of happiness. They also find that happiness inequality has increased significantly (comparing 2012-2015 to 2005-2011) in most countries, in almost all global regions, and for the population of the world as a whole.
https://worldhappiness.report/ed/2016/