The figure below shows an example of which functional group? 
Definitions:
Marginal Tax Rate
The rate at which the next dollar of taxable income is taxed; refers to the percentage of tax applied to the last dollar earned.
Tax Base
The total amount of assets or income that can be taxed by a government, providing a source of revenue.
Marginal Tax Rate
The percentage at which the last dollar of income is taxed, indicating how much tax will be paid on an additional dollar of income.
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