I think you're underestimating how complicated that is to do. If you've worked at any massive company its easy to understand how freaking hard it would be to ha

I think you're underestimating how complicated that is to do. If you've worked at any massive company its easy to understand how freaking hard it would be to have the sales department, the manufacturing and product design department, finance, business analytics, and seller auditing teams all working together in unison to pull this off. Yes its worth their time doing this for a few commodities everyone buys but theres no way the can do this for every single product category. In fact Amazon doesn't even make much margin off ecommerce. It's AWS. So it probably isnt even worth their time. Is it theoretically possible? Yes. Practically? At scale, its hard to say for sure.