You can't pay an exact amount because we literally have no way to calculate such an amount. How do you calculate usage for police, fire, military protection? Ho

You can't pay an exact amount because we literally have no way to calculate such an amount. How do you calculate usage for police, fire, military protection? How do you calculate the monetary value of being surrounded by educated people (which is what part of your taxes pay for)? You can't. We do have usage-based taxes for things where we can calculate the usage relatively easily, such as tolls for roads. A lot of other things however have to come from your income, because that's the easiest method that, believe it or not, requires the least bureaucracy. P.S. You can't opt out of police protection because... how would that work exactly?