How many high school students does it take to screw in a light bulb?
Only 1 student can screw in the light bulb. Hiring 2, 3 or even more students will not help complete the task any faster because there is only 1 light bulb socket available for the task.
The same simple concept can be extended and applied to much more complex tasks. For example, adding more workers beyond a certain point in a fixed factory can begin to produce less and less marginal output, for each worker added. This is because, at some point, something in the factory (for example working space, equipment available, or worker congestion) will begin to impede output. So if workers continue to be added, one can imagine there is a point in which the fixed factory become completely congested with workers, and the factory output grinds down to a near complete halt.
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