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By the end of the 21st century, it is expected that the human population will:
National Defense
The government's role and responsibility in protecting a country and its citizens from external threats and maintaining internal security.
Progressive Tax
A tax system in which the tax rate increases as the taxable amount increases, typically placing a heavier burden on wealthier individuals.
Benefits-Received Principle
A tax theory stating that those who benefit from government services should pay taxes in proportion to the amount of benefits they receive.
Government Expenditures
The total amount spent by the government on goods, services, and public projects.
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