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Re:What’s Behind the Ballooning Upper Middle Class? Education by paulpauper on Sunday July 17, 2016 @04:23PM (#12111637)
If everyone becomes 'upper middle' then it's no longer middle. Statistically, there will always be a lower, a middle, and an upper quartile.
Re:What’s Behind the Ballooning Upper Middle Class? Education by onion2k on Sunday July 17, 2016 @05:30PM (#12111941)
Only if the class system is based on statistics. It isn't. What class someone is in is defined by their values, beliefs, assets, etc. It's possible for everyone to be in one class.

Note that "lower class" isn't a thing. It's called "working class". That doesn't fit in your model.

Re:What’s Behind the Ballooning Upper Middle Class? Education by douche on Sunday July 17, 2016 @05:49PM (#12112047)
There's also a sub-working class, that is lower class, but doesn't or isn't able to work.