C93, I12, I21, I38, J12, J13, J22, J31
O33; J24; I21; O12; D83
C91, C93, D12, D81, I21, I26
I21, J24, D83
i21, i23, c93, d83, o33
I21, I28, C93, O33, O54
I23 (Higher Education; Research Institutions); I26 (Returns to Education); J24 (Human Capital
I21, I23, I24, J24, C93
C93, D91, I21, I24, J16
JEL I21, I24, C93, D91