In a 2005 issue of the Review of General Psychology, Sonja Lyubomirsky, Kennon Sheldon, and David Schkade looked at years of research to figure out what contributes to “chronic happiness” (as opposed to temporary happiness). Based on their survey, they came up with a three-part model: About half of your happiness is biological. Each person seems to have a happiness “set point,” which accounts for roughly 50% of your sense of well-being. Because this set point is genetic, it’s hard to change. Another 10% of happiness is based on circumstances — external factors beyond your control. These
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