I1, I12, I18, I20, I3
A20 C93 D83 I21 I23
I21, I24, I 31
: C93 (field experiments), D15 (intertemporal household choice), I21 (analysis of education)
J24, J21, J16, I24
I23, I24
I21, J24
I1, I12, I18, I20, I3
I12, I21, O15
I10, I20, I24, I25