[JAlexoid]

Buyback agreements don't change the fact that the ownership of goods is transferred to BigStore(tm).

BigStores do place based on profitability, that profitability may be boosted by marketing spend...

Theoretical Nabisco also cannot force a discount on their products... or even set a sale price.

I worked in procurement contracting long enough to know that despite some risk sharing(aka buybacks), the products are in full ownership of the retailer. They own the price, the discounts and the locations.