I think what Amazon is doing, and many other "startups" like Uber are doing is some form of dumping. They accumulate massive amounts of capital and then basically hand it to consumers to kill all competition while losing money. Clearly when Amazon flies toilet paper or laundry detergent to me, and has a man ring my doorbell and hand it to me, with a massive amount of packaging around it, for cheaper than going to get it myself at Walgreens, something is not right. They can be the only retailer left and that's still a big loss of money.
Well the point is monopoly right. When you have killed all competition, then you can do as you like. Massive profit.