Guy: How much is that? Fisherman: $10 per Kg Sir. Guy: I'll take that all (3Kg) for $20 Fisherman: $30 Guy: That's too easy to catch why don't you give them for $20? Fisherman: Okay, you do it by yourself, why buy if you know how to catch them easily? Guy: But I don't have a fishing net, I don't have a boat and I don't have time for that. Fisherman: That's not my problem Sir. If you want, you can rent my boat including the fishing net for $20/Hour. Guy: That's a waste of time, what if I won't catch a fish after an hour? Fisherman: You still pay me $20. Guy: Okay I'll take that all 3Kg for $30.