Normally I'm the first one out the gate to remind people that the legal standard in the US for monopoly isn't size or impact on competition but consumer harm...

Normally I'm the first one out the gate to remind people that the legal standard in the US for monopoly isn't size or impact on competition but consumer harm... Amazon could strangle all alternative product channels, but if they do so by legitimately finding a breakthrough that delivers product to people with 10x efficiency, that's (a) not actionable in the US and (b) great news, system works as intended, A++ would let winner win again. ... but in this case? Amazon has massive access to otherwise-secret price knowledge that they require sellers provide to participate in the marketplace. More than people realize and more than is shown in the UI (I did some work for a company that specialized in providing that data). If they used it to feed this algorithm, there's a real solid case that they used their unique market position to make things more expensive for no consumer benefit, and the antitrust case writes itself.