The World Happiness Report rankings are based on data from the Gallup World Poll, which uses a simple measure called the “Cantril ladder.” People are asked to envision a ladder, with their “best possible life” being a 10 on the top rung, and the worst possible life being a 0. Where does their life fall on that ladder?
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Six key variables are then used to explain those happiness scores, according to the report: “income, healthy life expectancy, having someone to count on in times of trouble, generosity, freedom and trust, with the latter measured by the absence of corruption in business and government.”