Read an article on why a multi-queue system causes more unhappiness as compared to a single-queue system. Answer was interesting - people were generally unhappy when they saw the line next to theirs moving faster and even though the waiting time is faster as compared to a single queue, the discontent remains. Hence, it would be better for businesses to use a single queue and install mirrors, because when the customer is occupied, the wait time will seem to be shorter.
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