Writer Mathew Yglesias disagrees with critics who claim that Amazon has a monopoly in the e-book market: "Amazon doesn't have any kind of monopoly.... One important hint ... can be found in its quarterly financial reports. That's where you find out about a company's profits."
a. What conditions would be necessary for Amazon to have a monopoly in the e-book market?
b. Do you agree that if Amazon were a monopoly, we could find evidence of that in its financial reports? Briefly explain.