As a novice, it seems extremely difficult to define what's too big. Her argument is that Amazon owns the platform where the deals are done and thus has an inher

As a novice, it seems extremely difficult to define what's too big. Her argument is that Amazon owns the platform where the deals are done and thus has an inherent advantage that undermines fair competition. Any established company has an inherent advantage over those just entering the market. They have market share, infrastructure, marketing, and so on. Amazon has a platform but of course anyone can sell through other channels. It's just a matter (of course a non-trivial one) of gaining traction. Personally I think Amazon is way too dominate, but I just don't know how you codify what line they've crossed. Maybe it's like the old porn definition - "I know it when I see it."