We use panel data from the German Socio-Economic Panel to estimate the determinants of language fluency of immigrants … and its impact on earnings. Self reported measures of language proficiency contain substantial reporting errors. We …, using panel data. The repeated information on language fluency allows us also to distinguish between cohort effects and …

' proficiency in the language of their adopted country is correlated with their productivity, as measured by earnings. Two … ability is linked with language acquisition, and potential measurement error in the language proficiency measures, which would … probably result in under-estimation of language effects. The present study, which uses panel data for a 10-year period in …