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o   Accounts of happiness may emphasise:

§  a life of virtue, meaning and personal growth (eudaimonic well-being), or

§  a positive cognitive evaluation or judgement of one's life (life satisfaction), or

§  pleasant affective experiences (positive emotions) and moods

o   Subjective well-being (SWB): satisfaction + positive affect - negative affect

o   Meta-analysis by Lyubomirsky et al (2005) showed that happiness predicts success in life (as measured by relationship satisfaction, work satisfaction and health/longevity)

o   Emotions affect life outcomes by influencing how people think, behave and interact

o   Previous studies had found that positive emotions inferred from smile intensity in college yearbooks was associated with marriage stability and satisfaction. It was found that smile intensity of major league baseball players from baseball register was associated with greater longevity. Those showing a Duchenne Smile were half as likely to die in any year as non-smilers.