Reply #3: sure

[maddiejoan]

First of all by dividing class into only 3 sections , you are already off because you eliminate the "working class".

That said, the reason for maintaning a middle class is it's stabilizing influence on society.
It has neither the revolutionary tendencies of the lower class, nor the absolutist tendencies of the entrenched wealthy elite.

Further it serves as a consumer base and helps to "feed the machine"

It's not a 3 class model at any rate. It's actually 5.

Upper class, Upper middle class, lower middle class, working class, and lower class.

You might argue that Republican systems favor shrinking the class system down to 3 classes --and finally to just two.