In the mall, each shop keeper has a knob, the red/green knob.
If the merchants chooses to make larger inventory shipments less often, that is hold inventory longer, then he turns the knob to the right and smart cards passing by will see more green and less red.
Exactly how it works today, the big sale, clear out whole chunks of inventory storage and make one large shipment coming in. The merchant knows the risk, he has a smart card.
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