You have exactly one advantage over Amazon.com, and that is the possibility of near instant gratification, of being able to lay your hands on a book or CD or DVD mere hours or even minutes after first desiring it. Of the factors working against you, two are paramount: (1) your inventory is necessarily limited by the physical size of your store; and (2) your retail model requires interaction with another human being. These obstacles being easily mitigated (by posting your inventory online), yet still inexplicably uncorrected, I must adjudge you lazy and incompetent, and what was at first a utilitarian judgment involving the time value of money is now a moral repugnancy toward ever patronizing so lax a market participant ever again. Also, your coffee is subpar.
P.S. Exactly what part of “Designing Social Inquiry” did your employee need me to spell for him?