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> Dumb people are not happier.

We have to differentiate between unintelligent and uneducated. For the latter, there are several studies showing that lack of education can mean lack of imagination of alternative. For example in The Idea of Justice Amartya Sen described the phenomenon of rural uneducated Indian women reporting less content with their own health after they received basic health education: Suddenly they were aware that there actually was an alternative to many of their miseries.