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Individual differences in happiness are partially heritable and are relatively stable.

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ideal affect, or preferred emotional state, differs among individuals and across cultures. For instance, Americans prefer high-arousal positive emotion, whereas East Asians prefer low-arousal positive emotion.

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High and very high happiness are associated with success in different domains (education v. relationships, respectively).

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Wealth correlates better than previously thought with happiness. However, wealth cannot buy happiness.

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Predictors of happiness (High self-esteem, outgoing personality, close relationships, work that engages, having goals in life, religious faith, sleeping well, exercise)

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The relative-deprivation principle: The sense that one is worse off than others.

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The adaptation-level principle: People adapt to a certain level of happiness and need something even better to continue to feel happy