>Raising prices then checking if so-called "competitors" follow is the illegal part - that's automated collusion, definitively illegal. This is completely fals

>Raising prices then checking if so-called "competitors" follow is the illegal part - that's automated collusion, definitively illegal. This is completely false. Collusion, legally, requires an agreement between competitors. Tacit collusion is *not* illegal, see Brooke Grp. Ltd. v. Brown & Williamson Tobacco Corp. (1993). Amazon can raise and lower their prices all day, algorithmically or not, as long as they aren't calling up their competitors and telling them to raise their prices too.