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"You may be required to pay a slotting fee to, in effect, purchase shelf space if there is a great deal of competition fighting for the same space."

no difference than paying for shelf space.

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The difference is that there are many stores to negotiate with for shelf space - in the online world there is only one serious player (although this does seem to be changing over time)

Except there is more competition in brick-and-mortar stores.

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