I know the original article provides some data in terms of what the "classes" are. It would be nice to have some DEFINITIVE numbers that says what the class ra

I know the original article provides some data in terms of what the "classes" are. It would be nice to have some DEFINITIVE numbers that says what the class ranges are. It seems like a moving target, and subject to wide interpretation. What salary ranges constitute poverty? middle class? upper-middle class? upper class? insane 1%? Is there even anything definitive to point to for these numbers?