: 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)

O33; D83: O16; L14; O17; L81

I20, I21, I24, I28, D83

D83, C91

D14, D81, D83, G41, G53, O33

A23, C93, J24, O31, L86, I31

A13, C93, D71, D72, D83, F22, H23, J15, J38, J60, J68, P16

D72, D91, H23, H41, Q52, Q54, Q58

D22, D83, J15, L14, O12, O15

J24, J33, D83