I think it is a reminder to vendors to rotate their stock.
If you keep putting new things on the shelf and leave the old product in the back, then it gets stale after a while: Bread, Milk, et cetera.
This would be an indication that the product has a definite expiration date and proper rotation of stock is essential...
My .02!
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Hey, if you are impressed with my memorizing pi to 10 digits, you should see the size of my penis.
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