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Re:Big Cities No Longer Deliver for Low-Skill Workers by dan-robertson on Wednesday January 23, 2019 @05:09AM (#18977056)
The median is what you get if you sort all people by income and pick the middle person. If one forces the median to be in the middle class then this forces the upper class to be large when the middle is small: Example with a large middle class:

  |...|...........|...|
    ^       ^       ^
    |     median    |
  (working)      (upper)
Example with small middle class:

  |.......|...|.......|
    ^       ^       ^
    |     median    |
  (working)      (upper)
Real life example with small middle class:

  |.............|...|.|
  (working) ^     ^  ^
          median  | (upper)
                middle
Re:Big Cities No Longer Deliver for Low-Skill Workers by dragonwriter on Wednesday January 23, 2019 @08:44AM (#18977999)
> If one forces the median to be in the middle class then this forces the upper class to be large when the middle is small

It doesn't force the working and upper class to be equally large unless you further assume the distribution is symmetric, but yes, there is a limit to how small the upper class can be since at least half of the distribution has to be split between the upper and middle class.