[jerf]

Contrary to popular belief, it is not illegal to have a monopoly; it is illegal to have an abusive monopoly. If Amazon really does build a system where they truly can sell everything cheaper than the competition could even hope to, and then they do, well... great! That's a pretty big win for society in general.

If, on the other hand, they use their monopoly position to illegally crush everyone else, then raise prices until the next time they have to crush someone, you have an antitrust case. And note that there's already more than a whiff of accusations about the former going on, that they are using Amazon stock price to power a market domination move which they will then use to monopolize and extract rent. It's a bit hypothetical at the moment, but it's not as if nobody's looking for this to occur.

Amazon's stock price is, IMHO, pretty clearly predicated on the "crush all opposition than extract rent" model being what the market expects to see, incidentally. Stay tuned.