Earlier quoted context omitted.
"Many retailers reserve some of their best shelves paces for their private label products" A key difference is that in those situations (a grocery store, for example), the marketplace owners have already purchased all the products on the shelves. It's the grocery store's decision to choose what and how the products that they have paid for are presented to customers. This is not a hundred-percent comparison, of course…
It might work like that in a mom-and-pop corner store, but for most retailers it is much more complicated than that. Larger stories like Target don't just buy a truckload of Playstations and then put them on the shelf. Instead, one of the ways it happens is that Target works out a specific deal with Sony where Sony essentially 'rents' the shelf space, and Sony then gets to design where on the shelf their products go…
So, while that is not an absolutely example (as lots of stuff in the store is still owned by the separate vending companies), it is a good caveat to our first "grocery stores do it" thought that comes to mind when thinking about this Amazon topic.