Amazon isn't selling products, really. It's selling last mile logistics. Walmart has historically been great at the rest of the logistics chain but never really

Amazon isn't selling products, really. It's selling last mile logistics. Walmart has historically been great at the rest of the logistics chain but never really invested in last mile. If nobody else can compete with Amazon, yes, Amazon executed better than anyone else. But they still have monopoly power. Typically a monopoly will have gotten to that position by executing better than everyone else, but that doesn't necessarily mean they should remain in the monopoly position unregulated.