This paper offers empirical evidence on the effect of mother-tongue instruction in primary school on students’ later labor market outcomes. Moreover, it explores whether the effect varies by the duration of exposure to mother-tongue instruction. Since Ethiopia has adopted mother-tongue instruction after the 1994 Ethiopian education reform, many students who have attended primary school after 1994 are exposed to mother tongue instruction, resulting in a variation in exposure to mother-tongue instruction by birth cohort. In Amhara state, Amharic is adopted as medium of instruction both before and after the education reform. This is in contrast to other states in Ethiopia that have changed the medium of instruction in primary school following the education reform. Among students who have been exposed to mother-tongue instruction following the education reform, however, the duration of their exposure to mother-tongue instruction varies depending on the state in which they have attended primary school. This is because states in Ethiopia mandate students to transition from mother-tongue to English instruction either in grade 5, 7, or 9. Exploiting these two plausibly exogenous sources of variations (across states and birth cohorts) and using data from the 2013 Ethiopian Labor Force Survey, we estimate difference-in-differences model. Estimates from our preferred specifications suggest that mother-tongue instruction in primary school improves later labor market outcomes, but the size of its effect decreases with the number of years an individual was exposed to mother-tongue instruction in primary school.

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