“Happiness pie” (approx 50% of differences are due to genetic factors, 10pct to life circumstances, & 40% available to be changed via volition) is a defective theory; & it is not clear how we can influence substantially our own happiness level

Brown, Nicholas J. L., and Julia M. Rohrer. 2018. “Re-slicing the “happiness Pie”: A Re-examination of the Determinants of Well-being” PsyArXiv. September 18. doi:10.31234/osf.io/qv85g

Abstract: In an influential article, Lyubomirsky, Sheldon, and Schkade (2005) argued that individuals have considerable leeway to increase their levels of chronic happiness. These authors supported their arguments with a model (subsequently popularized under the name of the “happiness pie”) in which approximately 50% of individual differences in happiness are due to genetic factors and 10% to life circumstances, leaving 40% available to be changed via volitional activities. We re-examined Lyubomirsky et al.’s claims and found several apparent deficiencies in their chain of arguments. First, it is not clear that such a split between the possible sources of variance in individual happiness is informative with respect to an individual’s potential to influence his or her well-being. Second, the suggested semi-formalized model of happiness suffers from several weaknesses that might bias the model in favor of assigning more variance to volitional activities. Third, the estimates for the variance attributable to genetic factors and life circumstances that were used to determine the relative size of the slices of the “happiness pie” are questionable. We conclude that there is little empirical evidence for the variance decomposition suggested by the “happiness pie,” and that even if it were valid, it is not necessarily informative with respect to the question of whether individuals can truly exert substantial influence over their own chronic happiness level.