Bookseller 1: We have had this book on the bottom shelf for a long time. It is a good book, but nobody's going to find it. I'm going to put it on display.
Bookseller 2: Well, OK. Yes, it is a good book but it is quite obscure and specialised, and has a bad cover. People will see it on display but they still won't buy it. If we put it on display, we are taking display space away from a book that we would sell.
Bookseller 1: Let's try it and see.
Bookseller 2: Well, OK. But only for a short time.
[30 seconds pass.]
Customer (enters shop and glances at display): Oh, look at that. I had better have that one. (Purchases book, exits.)
Bookseller 1 (aside): Ha ha.