Several studies, most of them employing straightforward regression analysis, have concluded that immigrants' proficiency in the language of their adopted country is correlated with their productivity, as measured by earnings. Two weaknesses of these studies are potential unobserved...

This paper analyses the labour supply decisions of a cohort of 16 year-olds who were born in 1958 in England and Wales. It traces through the effects of part-time employment by teenagers still in full-time education on subsequent academic performance and school leaving decisions within a three...