연구들의 분석 표본은 근로장려세제의 영향이 집중된 취약계층으로서 주로 저학력 한부모 여성에 초점이 맞추어졌다.
The analysis samples of the studies were mainly focused on low-educated single-parent women as the vulnerable class, where the influence of the labor incentive tax system was concentrated.