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