It also probably wasn't a good example as many of the Romance books have one or two copies (each isn't counted separately in the total above) while some books have a lot more so it's not necessarily 1 for 1.
Then there is something like Grant by Ron Chernow which even for consumers (without the huge library cost markup) costs $20 and they have 27 copies of it. Versus a lot of popular current Romances in the $5 to $8 range where they're buying one or two of each.
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