H23, D83, C91, Q54

D91, I21, I24, J15, J24, O15

D83, D84, E65, F16

D12, D83, O12, Z13

D91, I15, I25, O12, O15

D91 D12 D83 L81 M37

C91, D15, D91, G51

J62, J23, J68, D83, C93, J15

I21, J16, D91

: Underlying Principles), D82 (Asymmetric and Private Information), D83 (Search; Learning; Information

and Knowledge; Communication; Belief; Unawareness), L81 (Retail and Wholesale Trade; e-Commerce), L86 (Information Goods and Services, Internet Content)