It's so blatantly obvious if you've ever done a side by side in things like lamps, backpacks etc and other super simple designs.
Want an HDMI cable? Here's an overpriced Monster cable. Oh, don't want to pay absurdly high prices? Save money by buying one that is only 300% more than it should be instead of 400%!
The nice thing about Amazon was that it broke this model. Suddenly you could buy Anker or (insert small third party here) at very reasonable prices.
Amazon destroying those competitors is doing some damage to this, though.
They won't need to even call. Most FBA product listing inventory can be received directly from the factory (so Amazon knows exactly where it's made) and they can just go to the factory and offer to do 10x the volume for the exact same item (at a much higher discount).