@sjmcc13 In what 3rd world country exactly? We are talking about a Japanese salary man. In Japan 15k is not a lot, so he's reaction is completely off for a working adult, unless he is retarded, or the author fucked up and forgot about the premise of the story. Since it was not mention he's retarded, i assume it's the latter.
@U235 His reaction is fine. He only said he's never carried 15k around, and neither have I. It'd be in the bank, not in wallets. Surprise is also normal, since average salarymen wouldn't have made 15k in a single day.