Long-Term Effects of Class Size *
利用瑞典数据，研究发现小学最后三年（10-13岁）的小班教学能提升13岁时的认知与非认知能力、16岁时的学业成绩，并显著提高27-42岁时的教育完成度、工资和收入，且工资效应足以通过成本收益检验。
Abstract This article evaluates the long-term effects of class size in primary school. We use rich data from Sweden and exploit variation in class size created by a maximum class size rule. Smaller classes in the last three years of primary school (age 10 to 13) are beneficial for cognitive and noncognitive ability at age 13, and improve achievement at age 16. Most important, we find that smaller classes have positive effects on completed education, wages, and earnings at age 27 to 42. The estimated wage effect is large enough to pass a cost-benefit test.