Is Barnes and Noble's centralization over college textbooks a monopoly?

Answer 1

I would disagree with that. College bookstores control a large share of that market, especially for upper level courses. I would be very surprised if Barnes and Noble even had a majority of the market.

I did a quick search on Google for "college textbooks". Barnes and Noble didn't even come up. Amazon did, though. There are at least a dozen other large web-based bookstores, also.