This study empirically examined the influence of sibling size on happiness in China, distinguishing between direct and indirect channels of impact. Using data from the 2008 Chinese General Social Survey and employing instrumental variables to address endogeneity, the findings revealed an indirect relationship: increased sibling size negatively affected income and education levels, subsequently reducing happiness. The study highlights the policy implications, suggesting that initiatives to raise the birth rate should be coupled with efforts to enhance income and educational opportunities to foster individual happiness.

Honghui Li, Masato Hiwatari