Q15 ; Q57 ; O13 ; N56
C93 Field Experiments, D91 Role and Effects of Psychological, Emotional, Social, and Cognitive
C93, G40, Q50
D13, H31, L94, O13, Q41, Q48
JEL C93, D12, D83, L94, L98, Q41, Q48, H23
C93;D03;D21;D83;D84;J64;O17;O12
C93, D61, D01
C93, D91, J71, Z13
D13, Q12, Q16, O12, O13
D13, O12, O13, and Q12