*1.6. Human Capital/Social or Cultural Capital*

SWB is positively correlated with education level, which is often used as a measure of human capital [17]. Several studies included the levels of education as control variables and found statistically significant coefficients for the variables [25–27].

Social relationships are also correlated with SWB [12], which can be identified with social capital. Several studies analyzed above include social relationships, such as participation in volunteering activities [27] and the number of people who can be relied upon [26], with a statistically significant correlation and insignificant results, respectively.
