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So you can never leave a queue? Queuing would then be discouraged, wouldn't it? Making the move to buy something would often ensure you can't buy it but can also not buy anything else because someone else will cut in front of you and if you're out of luck, you'll be stuck in the queue forever, abandoning it is not allowed. Enjoy starving for greater efficiencies.

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I'm not well versed in queuing theory, but I would assume that's rather the point. The existence of an unboundedly growing queue implies an inability to keep up with demand, so someone has to lose. The most shameless queue jumpers get served earlier because they have the highest priority. Anyone stuck in the queue didn't have a high enough priority in the first place.

From a utilitarian standpoint it makes sense :shrug:

With normal queuing, you get served eventually and can calculate the time it will take to get what you need. I fail to see how removing both of those parts makes it more efficient, and intuitively it seems that it would mostly lead everyone to avoid queuing unless absolutely necessary or to only try to buy things that surely nobody else wants. Mean wait time down, only the least desired products get bought, and even those only when starvation is the alternative.

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