C93 (field experiment), J24 (Human Capital • Skills • Occupational Choice • Labor Productivity
O12, O15, J15, I38
C01, D91, I12
I12, Q51, Q53
D12, D91, I12, J16, O12, Z13
C93, I12, I18, J13, J16, O35
Health, Education and Welfare
I21, I25, J13, J24, O15, C93
I12, I15, I25, J15, O15
J13, I12