The paper extends the school quality literature by examining the impact of homework on educational achievement. Theory predicts a positive effect of homework, up to a point. The theory is tested using the Longitudinal Study of American Youth. The amount of math homework assigned positively affects math achievement for virtually all students. An extra half hour of nightly homework between Grades 7 and 11 is predicted to boost math achievement by almost two grade equivalents. Additional homework is potentially cost-effective, since it is the homework assigned, rather than the amount graded, which is more has the larger influence on achievement.

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