Equality is a mathematical concept. And since wages are measured in numbers that is the measure of equality. Proportionality is equality.
it is Not a Capital concept regardless of any mathematical computations required for the sake of accuracy, nothing more.
If you pay 25 cents for every dollar earned and I pay 25 cents for every dollar earned how is that not equal?
It does not reflect a progressive tax rate
If I pay 25 cents on every dollar and I need my paycheck to support a family, pay for healthcare and put a roof over my head
You pay 25 cents on every dollar and are a multimillionaire
We should not pay the same rate