M11, M21, O33,
J23, J24, O33, L2, M54, D83
I25, O15, O33
I25: Education and Economic Development, C93: Field Experiments, O33: Technological Change. Diffusion and Adoption, O55: Africa
O33
O33
I11, O33, D83
A22 C93 I14 I24 J24 O33
C93, J23, J24, M51, O33
I21 — Analysis of Education O33 — Technological Change: Choices and Consequences; Diffusion