In most industrialized countries the majority of employed people are full-time employees with a non-temporary job and work at a workplace of the company in which they are employed. They are making careers at the employer they are employed by and most work-place changes are to other jobs of the...

In a recent paper, García-Mainar and Montuenga-Gómez (2005) 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...