[E20] Next, let's think about the effect that this changing number of passengers has on the streetcars' waiting time. The more passengers there are, the longer that time will be. Even if all of the passengers are well-behaved gentlemen, the time it takes them to board will increase as their number rises. If some try to force their way on board without waiting for disembarking passengers to get off or if some get into arguments with the conductor, then the waiting time will be even longer. When that happens, what is the result?
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