>>>With a flat tax, they will be.
>
>IMHO it's more likely that people will form ranks on partisan lines and then cherry-pick statistics to support the party line, forcing compromises and manoeuvrings that invariably benefit those who can fund the most furore or drag the country closest to the brink. That's what happens now. In addition, my experience has been that the most concentrated wealth stays within privileged families for generations and/or is otherwise geared to defer tax, often forever.

Purchase something not for resale or medical requirement? 10% (or whatever).

Purchase something for resale (with reseller ID) or medically required? - 0% tax.

Sit on your income? OK. Does you a lot of good.

Spend any? See above.