The Effect of a Change in Language of Instruction on the Returns to Schooling in Morocco
利用摩洛哥1983年将公立学校六年级以上教学语言从法语改为阿拉伯语的政策变化，估计法语技能对考试成绩和收入的影响，发现取消强制法语教学显著降低了受影响人群的教育回报，主要归因于法语写作能力的丧失。
Until 1983, the language of instruction for most subjects in grades 6 and above in Moroccan public schools was French. Beginning in 1983, the language of instruction for new cohorts of Moroccan sixth graders was switched to Arabic. We use this policy change to estimate the effect of French language skills on test scores and earnings. The estimates suggest that the elimination of compulsory French instruction led to a substantial reduction in the returns to schooling for Moroccans affected by the change. This reduction appears to be largely attributable to a loss of French writing skills.