Here's a cite: https://www.cambridge.org/core/journals/psychological-medicine/article/abs/relationship-between-happiness-and-intelligent-quotient-the-contributi

Here's a cite: https://www.cambridge.org/core/journals/psychological-medicine/article/abs/relationship-between-happiness-and-intelligent-quotient-the-contribution-of-socioeconomic-and-clinical-factors/852640AC984DB7EC623D9D2C1A2D0A5A https://www.cambridge.org/core/journals/psychological-medici... Of course it's not the only thing, and can be greatly mediated by other factors. From the book Age of Em, citing that and other sources, "people today tend to be both happier and more productive when they have jobs, autonomy at work, health, beauty, money, marriage, religion, intelligence, extroversion, conscientiousness, agreeableness, and non-neuroticism." I brought up Lisa Simpson because there's this meme: https://flowingdata.com/wp-content/uploads/2008/06/lisa-simpson-graph1.jpg https://flowingdata.com/wp-content/uploads/2008/06/lisa-simp... It's a popular take, but it's wrong.