In that scenario HUP has no clear idea of what he wants. When you get an indecisive person like that, it's nobody's fault but the sales person of letting the HUP walk out of the store without buying at least something. It's much easier to talk somebody into buying a book if he basically doesn't know much, than it is to talk somebody into buying when they have preconceived notions and a made up mind regarding anything.
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