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How Do Classmates Matter for the Class-Size Effects?

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  • Tanaka, Ryuichi

    (University of Tokyo)

  • Wang, Tong

    (Ritsumeikan University)

Abstract

This paper investigates the effect of class-size reduction on students’ academic outcomes, with a particular emphasis on its heterogeneity based on classmates’ characteristics. We estimate the causal effects of class-size reduction on students’ mathematics and language test scores by controlling for student and teacher fixed effects. To address potential endogeneity, we employ the predicted class size with a cap as an instrumental variable for the actual class size. Utilizing rich panel data on Japanese primary school students, our findings indicate a positive and robust average effect of class-size reduction on mathematics test scores. Furthermore, we find that classes with high-ability classmates benefit even more from class-size reduction in terms of language test scores. The effect of class-size reduction on mathematics test scores is found to depend positively on the ability of the lowest-achieving student in a class. Additionally, classes with a higher proportion of female students tend to benefit more from class-size reduction. Our results lend support to the theoretical framework proposed by Lazear (2001).

Suggested Citation

  • Tanaka, Ryuichi & Wang, Tong, 2025. "How Do Classmates Matter for the Class-Size Effects?," IZA Discussion Papers 18025, Institute of Labor Economics (IZA).
  • Handle: RePEc:iza:izadps:dp18025
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    References listed on IDEAS

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    1. Kedagni, Desire & Krishna, Kala & Megalokonomou, Rigissa & Zhao, Yingyan, 2021. "Does class size matter? How, and at what cost?," European Economic Review, Elsevier, vol. 133(C).
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    3. Oriana Bandiera & Valentino Larcinese & Imran Rasul, 2010. "Heterogeneous Class Size Effects: New Evidence from a Panel of University Students," Economic Journal, Royal Economic Society, vol. 120(549), pages 1365-1398, December.
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    5. Michael Gilraine, 2020. "A Method for Disentangling Multiple Treatments from a Regression Discontinuity Design," Journal of Labor Economics, University of Chicago Press, vol. 38(4), pages 1267-1311.
    6. Hideo Akabayashi & Ryosuke Nakamura, 2014. "Can Small Class Policy Close the Gap? An Empirical Analysis of Class Size Effects in Japan," The Japanese Economic Review, Japanese Economic Association, vol. 65(3), pages 253-281, September.
    7. Miguel Urquiola, 2006. "Identifying Class Size Effects in Developing Countries: Evidence from Rural Bolivia," The Review of Economics and Statistics, MIT Press, vol. 88(1), pages 171-177, February.
    8. Hanushek, Eric A, 1986. "The Economics of Schooling: Production and Efficiency in Public Schools," Journal of Economic Literature, American Economic Association, vol. 24(3), pages 1141-1177, September.
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    Keywords

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    JEL classification:

    • J13 - Labor and Demographic Economics - - Demographic Economics - - - Fertility; Family Planning; Child Care; Children; Youth
    • J18 - Labor and Demographic Economics - - Demographic Economics - - - Public Policy
    • N35 - Economic History - - Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy - - - Asia including Middle East

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