[samdixon]

I don't know how large of a concern this is, but Amazons wide growth allows using revenue from their higher profit sectors (such as aws) to force out competitors in other lower margin sectors they are involved with such as grocery stores. This also may very well be a strategy other large conglomerates utilize.

Video on subject: https://youtu.be/EYPs-ya_GDA?t=128

[lotsofpulp]

Grocery stores use high margin products to sell staples such as bread and meat at cost or loss and force out smaller players like bakers and butchers.