Earlier quoted context omitted.
A flat tax would be more regressive than a progressive tax scheme - it's a spectrum. > That's about as equal and fair as you can get Equal in terms of % of income paid: yes, fair: no way. Your statement makes the assumption that the opportunities to gain higher income are equally and fairly distributed, which they are manifestly not.
Actually I just tried to tease out a definition from the investopedia article, which I was mislead reading the sales tax example which has a fixed amount (the price of some taxable goods) which holds no sliding scale based on income. The regression appears to be strictly around the idea of burden to the individual and how much disposable income they get left with. Looking at the wikipedia article they claim that flat…
> [A flat tax is] about as equal and fair as you can get
I disagree about the fair part, but we likely have different ideas about what fair means in this context. For me, equal opportunity to income mobility is part of what fair means.