“…Majority of the studies have controlled for socio-demographic variables including age, gender, education, unemployment, and other variables. There are 31 mediating variables, while in some cases, the socio-demographic variables, namely age and gender, are also used as mediating variables [13,181,209].On the other hand, with respect to the independent variable, income and other income-related variables, namely, absolute or per capita income [132], relative income [74,195], household income [59,135], level of income or area-level income inequality [78,139,164,174] are seen as the highest independent variables in impacting happiness/ subjective well-being/ life satisfaction.…”