Happiness fact 9: happiness = 50% genetic+40% our activities+10% circumstance

Factors influencing chronic happiness levels:
- 50% Genetic Tendencies
- 40% Intentional Activities
- 10% Circumstance

Lyubomirsky suggests that 30-40% of the difference in happiness levels is due to genetics (i.e. heritable). In other words still, Diener says it makes no sense to say one person's happiness is "due 50% to genetics", but it does make sense to say one person's difference in happiness is 50% due to differences in their genetics (and the rest is due to behaviour and environment).

Source: Sonja Lyubomirsky, US, 2010

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