In a debate about taxes, Mark argues that the rich already pay a disproportionate amount of the overall taxes and that we should not tax them at a higher rate just because they make more money. He is arguing against .

progressive taxation

Explanation:

In a debate about taxes, Mark argues that the rich already pay a disproportionate amount of the overall taxes and that we should not tax them at a higher rate just because they make more money. He is arguing against PROGRESSIVE TAXATION.

A PROGRESSIVE TAX is a tax in which the tax rate increases as the taxable amount increases. The term "progressive" refers to the way the tax rate progresses from low to high, with the result that a taxpayer's average tax rate is less than the person's marginal tax rate.

Progressive taxation

Explanation:

A progressive taxation can be defined as the way in which the tax rate begins to increase just as the tax amount increase by progressing from low to high due to the fact that a taxpayer's average tax rate is less than the person's marginal tax rate which was why the system of PROGRESSIVE TAX ensures that all taxpayers endeavour to pay the same rates on the same levels of their taxable income leading to effect that people with higher incomes pay higher taxes which simply means the higher a person income level is the higher a tax rate the person pay.

Therefore based on the information given Mark was arguing about PROGRESSIVE TAX OR PROGRESSIVE TAXATION.

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