Final answer:
Scenario 1 illustrates a proportional (flat) tax system with equal tax amounts, Scenario 2 also shows a proportional system with taxes as a flat percentage of income, while Scenario 3 demonstrates a progressive tax system with higher earners paying higher percentage rates.
Step-by-step explanation:
For each scenario, we'll identify and explain the type of tax structure described.
Scenario 1
Mary and Caleb have different incomes but pay the same amount in taxes. This represents a proportional tax system, also known as a flat tax. In a flat tax system, all taxpayers pay the same absolute amount or same percentage of income, regardless of their earnings.
Scenario 2
Kevin and Trey pay a fixed percentage of their income as tax. This is characteristic of a proportional tax system, where the tax rate is the same for all income levels, meaning each person pays taxes at the same percentage rate of their income.
Scenario 3
Martin and Lori pay different percentages of their income based on what they earn. This is an example of a progressive tax system, where the tax rate increases as the taxable amount increases. People with higher incomes are taxed at higher percentage rates.