Supermarkets tell the producers what they will pay for their products and if the producers says no then they won't buy their products. Then there is the premium placement in the stores that the producers pay for it can be thousands of pounds per day, that's why you see a product in one place for a set time them it's shifted to somewhere else when they don't pay for premium placement slots.
The likes of Aldi and Lidl mainly sell their own products so there is no premium placement payments to these stores.
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The likes of Aldi and Lidl mainly sell their own products so there is no premium placement payments to these stores.