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My theory regarding this it's the following: I helped for a while in a family related retail business and there was a lot of need for consumable products like pens/papers etc or just barcode scanners/toners and so on...

Recommending for similar products at the end of a purchase raised awareness towards those items for the next inevitable batches. I believe amazon wants its own brands to win or otherwise a strong competition among others producers.

I can't believe it's just math.

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