교육 및 노동시장 성과에 대한 환경의 영향력:KLIPS의 쌍둥이 자료를 이용한 분석

This study analyzes how genetic and environmental factors impact an individual’s socioeconomic outcomes. By controlling for genetic variability, we estimate the sibling correlation for outcome variables among children within the same household. Distinct from prior research, this study differentiates between shared and non-shared environmental factors. We construct twin data from the Korea Labor and Income Panel (KLIPS), built over the past 25 years, and compare the sibling correlation between twins and non-twin siblings. The findings are as follows. First, treating the twin group as the treatment group and siblings with age differences of 1~5 years as the control group, the sibling correlation for educational outcomes in the twin group is the highest at 0.51. In contrast, when the age difference is 5 years, the ICC is the lowest at 0.31. Second, labor market outcomes, measured by wages, also have the highest ICC in the twin group at 0.81. It steadily decreases to 0.45 when the age difference is 1 year and 0.38 when it is 5 years. Through this study, we propose a new research topic using twin data constructed from KLIPS data, suggesting the importance of shared environments on individual socioeconomic outcomes. Targeted policies emphasizing shared experience during early childhood can help bridge the gaps in employment, wages, and social status among individuals.