Progressive method that used to calculate the income tax?

What do u think about the Progressive method that used to calculate the income tax?
whats the advantages and the disadvantages of the Progressive method that used to calculate the income tax in the world , and i want to know if it is a fair method from an economic and accounting perspectives ?????? what do u think about the idea of Unification of the income tax rate in all the economic sectors .? thanks Additional Details i mean to make the income tax rate constant for all the sectors no matter of the amount of income that generate
Progressive taxation is a feature in any country's income tax. Plan on the concept not changing.

How do I calculate income tax for a minor owning his own business?
Does it vary depending on if your hired by a business or if youoen your business?
like anyone else who has a business the Sch C(which has no entry for age) will be your report of income and expenses when you determine what your net it you file a Sch SE(self employment tax, approx.15.3% of the 'net') and bring that forward to your 1040 as a minor you are not entitled to your personal exemption but you still have a limited amount of your standard deduction to apply

How do i calculate income tax for georgia?
i just want to know how much is deducted for minimum wage. i'm doing calculations and such, trying to see how much money can be saved being paid min. wage. how much is taken off in georgia? please help me out, no worthless answers please! thanks.
go to georgiairs.com