I wouldn’t call it jealousy to want everyone to be served in the order they arrived, since that’s obviously the intention of flat unprioritized queues. You can

I wouldn’t call it jealousy to want everyone to be served in the order they arrived, since that’s obviously the intention of flat unprioritized queues. You can certainly make arguments that FIFO isn’t the best or right way to process a grocery store checkout queue, but for now I’d rather it be implemented well rather than poorly.