Month-of-birth effects on skills and skill formation
研究了出生月份对认知和非认知技能的影响，发现同年级中年龄较小的学生技能较低，且与同学和老师的关系质量较差，可能损害非认知技能的长期发展。
We estimate month-of-birth effects on cognitive and noncognitive skills, as well as factors relevant to skill formation. Our estimates indicate that younger students in a given grade cohort have lower cognitive and noncognitive skills. To shed light on the underlying mechanisms, we also examine children’s time use and interpersonal relationships. We find evidence of compensatory investment in cognitive skills by younger children, however, they are also more likely to have poor-quality relationships with their classmates and teachers, which may harm the long-term development of noncognitive skills. Our findings on skill formation have implications for efficiency and equity.