Skip to content

Research Paper IZA Discussion Papers 4419

The causal effect of education on wages revisited

Authors

Publication date

01 Sep 2009

Abstract

This paper estimates the return to education using two alternative instrumental variable estimators: one exploits variation in schooling associated with early smoking behaviour, the other uses the raising of the minimum school leaving age. Each instrument estimates a 'local average treatment effect' and my motivation is to analyse the extent to which these differ and which is more appropriate for drawing conclusions about the return to education in Britain. I implement each instrument on the same data from the British Household Panel Survey, and use the over-identification to test the validity of my instruments. I find that the instrument constructed using early smoking behaviour is valid as well as being strong, and argue that it provides a better estimate of the average effect of additional education, akin to ordinary least squares but corrected for endogeneity. I also exploit the dual sources of exogenous variation in schooling to derive a further IV estimate of the return to schooling. I find the OLS estimate to be considerably downward biased (around 4.6%) compared with the IV estimates of 12.9% (early smoking), 10.2% (RoSLA) and 12.5% (both instruments).

Subjects

Human Capital, Education, Wages And Earnings, and Health

Links

http://EconPapers.repec.org/RePEc:iza:izadps:dp4419

Notes

Judi; Econpapers search; working paper

#512843


Research home

Research home

News

Latest findings, new research

Publications search

Search all research by subject and author

Podcasts

Researchers discuss their findings and what they mean for society

Projects

Background and context, methods and data, aims and outputs

Events

Conferences, seminars and workshops

Survey methodology

Specialist research, practice and study

Taking the long view

ISER's annual report

Themes

Key research themes and areas of interest