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shopping rule theory
(media.kbin.run)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
True. Come to think of it, at least with the coin system there is an incentive for another customer to bring the cart back.
On the flip side, where I live people sometimes bring their cart back but don't connect it to the others, so that somebody else can use it without needing a quarter. Those people are nice. :)