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Description: One of the most puzzling social science findings in the past half-century is the Easterlin Paradox: Economic growth within a country does not always translate into an increase in happiness. We provide evidence that this paradox can be partly explained by income inequality. In two different datasets covering 34 countries, economic growth was not associated with increases in happiness when it was accompanied by growing income inequality. Earlier instances of the Easterlin Paradox (i.e., economic growth not being associated with increasing happiness) can thus be explained by the frequent concurrence of economic growth with growing income inequality. These findings suggest that a more even distribution of growth in national wealth may be a precondition for raising nation-wide happiness.