Thanks for posting this - much more informative than the originally posted article. Khan seems to be arguing that Amazon has two types of monopoly power - hori

Thanks for posting this - much more informative than the originally posted article. Khan seems to be arguing that Amazon has two types of monopoly power - horizontal monopoly power in specific sectors, e.g. books, and vertical monopoly power in ecommerce. I agree that the first type should probably be more heavily regulated, though there's room for debate as to the appropriate level of granularity. (Should regulators look at Amazon's market share for books? Ebooks? Textbooks? Educational material? Entertainment?) But as for the second type, I'm not convinced that there are strong economic arguments in favor of regulating vertical monopolies as long as the monopolist doesn't have horizontal monopoly power at any level of the supply chain. After all, as long as there's no horizontal monopoly power, competitors are free to vertically integrate themselves through M&A or organic expansion if the benefits of vertical integration are that significant. Of course, it's possible that AWS should be regulated as a horizontal monopoly in the IaaS space based on its nearly 50% market share. But IMO, any such regulation should only impact AWS (and any other areas in which Amaon has horizontal monopolies), not Amazon as a whole.