C93, I21, I23
C93, I20, I21, O15
H52, I21, O15
A20 C93 D83 I21 I23
I21, I24, I 31
: C93 (field experiments), D15 (intertemporal household choice), I21 (analysis of education)
I21, J24
I12, I21, O15
C21, C93, D1, D81, D90, I12, I21
C21; C93; D1; D81; D90; I12; I21