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happiness government quality nation people inequality level geluk correlation world governance research value effect relation income question condition policy impact overheid freedom wealth kwaliteit veenhoven well-being growth indicator difference self-reported happiness citizen utility american tussen preference chapter source development equality problem landen worden layard university score world database explanation point kwaliteit van world bank factor stress competition table measure government consumption option happiness studies happiness research democracy market journal state erasmus university rotterdam society income inequality press mensen decision study analysis companionship importance consumption conclusion satisfaction government quality survey consequence priority