[djakjxnanjak]

>Retail stores buy the products they put on their shelves, at wholesale prices. They then mark up the prices to a retail price charged to the end buyer when they resell the products to the end buyer.

Why is this difference salient? This process of selling, reselling and markup recurs for years. Economically the outcome is the same as the store charging a fee like Amazon, just with the payments split up and time shifted. If you doubt that the same power imbalances exist in brick-and-mortar, read about how Walmart squeezes suppliers.