Looking over the thread, I just realized something funny (well, the other two econ majors out there should laugh). The answer to your basic question " Is Amazon monopolistic?" is yes in econ terms, but a monopolistic market is not the same as a monopoly. A monopolist market, by (economic) definition, has many sellers, not just one (counter-intuitive, I know), and perceived product differences. That pretty well describes this sitch.
Jack
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