Answer:
progressive taxation
Step-by-step 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.