“Let’s make EVERY U.S. citizen pay a flat tax (fair tax, whatever)...”
I favor a “Lump Sum” tax. Every adult pays the same dollar amount in taxes, regardless of income, employment, education, marital status, number of children, etc: The same dollar amount, no deductions.
Liken it to purchasing a car. If a car dealer sells a car for $15K, the car costs 15K. Period. Say you make twice as much money as I do. The dealer won’t charge me half of what he would charge you just because I make half of what you do.
If you or I can’t pay for the car, we don’t buy it.
If you or I can’t pay the lump sum tax, we don’t vote.
Every adult pays the same dollar amount. What could be more fair than that?
Dealers generally have a variety of cars for people to choose from. Some people would find a $15,000 car too expensive, and so would buy something cheaper. Others would find a $15,000 car unsatisfactory, and so would buy something more expensive. I am unaware of any government offering anything like that option.