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Jordahl, Henrik; Poutvaara, Panu; Tuomala, Juha (2009): Education returns of wage earners and self-employed workers: Comment. In: Economics of Education Review, Vol. 28, No. 5: pp. 641-644
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Abstract

In a recent paper, García-Mainar and Montuenga-Gómez [García-Mainar, I. \& Montuenga-Gómez, V. M. (2005). Education returns of wage earners and self-employed workers: Portugal vs. Spain. Economics of Education Review, 24(2), 161-170] apply the generalized IV model of Hausman and Taylor to estimate education returns of wage earners and the self-employed in Portugal and in Spain. Our examination reveals several problems which relate to the validity and documentation of the instrumental variables, as well as the robustness of the results.