Using a rich longitudinal data set from birth, we explore three estimation issues related to academic performance analysis. Our paper primarily examines the effect of omitting childhood and teenage characteristics (childhood ability, parental resources at different times and peer effects), which...

The recent international literature on immigration wage effects has shown contrasting results. Past studies have focussed on the effect of low skilled immigrants on native-born workers in the US, and have yielded results ranging from no impact to negative impacts. This paper, by contrast,...