Issues in the Theory of Human Capital : Education as Investment. The Pakistan Development Review, [S. l.], v. 21, n. 1, p. pp.1–17, 1982. DOI: 10.30541/v21i1pp.1-17. Disponível em: https://thepdr.pk/index.php/pdr/article/view/583. Acesso em: 26 oct. 2025.