The Real-world Case
In a real building, there are complicated factors such as the tendency of elevators to be frequently required on the ground or first floor, and to return there when idle. These factors tend to shift the frequency of observed arrivals, but do not eliminate the paradox entirely. In particular, a user very near the top floor will perceive the paradox even more strongly, as elevators are infrequently present or required above their floor.
There are other complications of a real building: such as lopsided demand where everyone wants to go down at the end of the day; the way full elevators skip extra stops; or the effect of short trips where the elevator stays idle. These complications make the paradox harder to visualize than the race track examples.
Read more about this topic: Elevator Paradox
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