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Re:Elizabeth Warren Proposes Breaking Up Tech Giants Like Am... by andromeduck on Friday March 08, 2019 @12:13PM (#19339528)
That's not really how it works anymore. It depends on the product type but often brands pay for shelf space and unsold goods are refunded.
Re:Elizabeth Warren Proposes Breaking Up Tech Giants Like Am... by NeedMoreTea on Friday March 08, 2019 @12:20PM (#19339614)
They call it the back margin. Brands buy shelf space, position, pay for offers and promotions, extra payments (effectively a fine) if volume targets are not reached, etc.

Tesco infamously had 24 ways of extracting extra money from suppliers via back margin. The front margin is the traditional agreed buying price.