D63, D72, D91, J46, O15, R23, Z13
I12, I15, O12, J13
I3, J1, O12
i21, i23, c93, d83, o33
O12, L26
C93, J24, J64, J68, I26, J46
H51, H53, I18, I38
I21, I28, C93, O33, O54
I23 (Higher Education; Research Institutions); I26 (Returns to Education); J24 (Human Capital
; Diffusion Processes); O15 (Human Resources; Human Development; Income Distribution; Migration)
C93; D73; I38