This discussion paper has resulted in ch. 4 of <A href="http://books.google.nl/books?hl=nl&lr=&id=edksC0nRPZYC&oi=fnd&pg=PR7&dq=allesintitel:+%22Labor+Market+Institutions+and+Public+Regulation%22&ots=-umxBkjdnT&sig=oeFDTjhnSeo-w-4nuTjTJpuaUr8#v=onepage&q=&f=false">'Labor Market Institutions and Public Regulation'</A>, pp. 123-61, (Jonas Agell, Michael Keen, Alfons Weichenrieder (eds.)), 2004, MIT Press, 228 p.

Estimates of the effect of education on GDP (the social return) have been hard to reconcile with micro evidence on the private return to schooling. We present a simple explanation combining two ideas: imperfect substitution and endogenous skill-biased technological progress and use cross-country...