Elevator paradox

:"This article refers to the elevator paradox for the transport device. For the elevator paradox for the hydrometer, see elevator paradox (physics)."

The elevator paradox is a paradox first noted by Marvin Stern and George Gamow, physicists who had offices on two different floors of a multi-story building. Gamow, who had an office near the bottom of the building, noticed that the first elevator to stop at his floor was most often going down, while Stern, who had an office near the top, noticed that the first elevator to stop at his floor was most often going up.

At first sight, this created the impression that perhaps elevator cars were being manufactured in the middle of the building and sent upwards to the roof and downwards to the basement to be dismantled. Clearly this was not the case. But how could the observation be explained?

Modeling the elevator problem

Several attempts (beginning with Gamow and Stern) were made to analyze the reason for this phenomenon, which is more difficult to analyze than it first seems.

Essentially, the explanation is: a single elevator spends most of its time in the larger section of the building, and thus is more likely to approach from that direction when the prospective elevator user arrives. An observer who remains by the elevator doors for hours or days, observing "every" elevator arrival, rather than only observing the first elevator to arrive, would note an equal number of elevators traveling in each direction. This then becomes a sampling problem- the observer is sampling stochastically a non uniform interval.

To help visualize this, consider a thirty story building, plus lobby, with only one slow elevator. The elevator is so slow because it stops at every floor on the way up, and then on every floor on the way down. It takes a minute to travel between floors and wait for passengers. Here is the arrival schedule for people unlucky enough to work in this building:

If you were on the first floor and walked up randomly to the elevator, chances are the next elevator would be heading down. The next elevator would be heading up only during the first two minutes at each hour, e.g., at 9:00 and 9:01. The number of elevator stops going upwards and downwards are the same, but the odds that the next elevator is going up is only 2 in 60.

A similar effect can be observed in railway stations where a station near the end of the line will likely have the next train headed for the end of the line. Another visualization is to imagine sitting in bleachers near one end of an oval racetrack: if you are waiting for a single car to pass in front of you, it will be more likely to pass on the straight-away before entering the turn.

More than one elevator

Interestingly, if there is more than one elevator in a building, the bias decreases - since there is a greater chance that the intending passenger will arrive at the elevator lobby during the time that at least one elevator is below him; with an infinite number of elevators, the probabilities would be equal. Watching cars pass on an oval racetrack, one perceives little bias if the time between cars is small compared to the time required for a car to return past the observer.

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.


* Martin Gardner, "Knotted Doughnuts and Other Mathematical Entertainments", chapter 10. W H Freeman & Co.; (October 1986). ISBN 0-7167-1799-9.

* Martin Gardner, "Aha! Gotcha", page 96. W H Freeman & Co.; 1982. ISBN 0-7167-1414-0

External links

* [http://www.kwansei.ac.jp/hs/z90010/english/sugakuc/toukei/elevator/elevator.htm A detailed treatment, part 1] by Tokihiko Niwa
* [http://www.kwansei.ac.jp/hs/z90010/english/sugakuc/toukei/elevator2/elevator2.htm Part 2: the multi-elevator case]
* [http://mathworld.wolfram.com/ElevatorParadox.html MathWorld article] on the elevator paradox

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