Mostly summarized from Gregory Mankiw’s Principles of Economics, 5th Ed.
PART 4 The Economics of the Public Sector
Chapter 12 of 36 The Design of the Tax System 
Section 2 of 22
In 1789 and for the next hundred years the average American paid less than five percent of his income in taxes.
Today, all taxes taken are about a third of the average American's income, including
· personal income taxes
· payroll taxes
· sales taxes
· property taxes
· corporate income taxes
Taxes are required because government must provide various goods and services.
Restated from Chapter 1, the Ten Principles of Economics:
1: people face trade-offs
2: the cost of something is what you give up to get it
3: rational people think at the margin
4: people respond to incentives
5: trade can make everyone better off
6: markets are usually a good way to organize economic activity
7: governments can sometimes improve market outcomes
8: a country's standard of living depends on its ability to produce goods and services
9: prices rise when the government issues too much money
10: society faces a short-run trade-off between inflation and unemployment
One of the ten principles of economics, #7: governments can sometimes improve market outcomes.
Government taxing and spending can raise economic well-being, including by
· law enforcement, including contracts and patents
· providing public goods such as roads and national defense
· remedying externalities such as air pollution
 In previous chapters we have seen
· a tax reduces the quantity of a good or service sold in a market
· how the burden of a tax is shared partly by buyers and partly by sellers, the amounts depending on the elasticities of supply and demand
· taxes cause deadweight losses because reduction in consumer and producer surplus exceeds the revenue raised by the government
Most people agree the tax system should be both efficient and equitable.
Taxes should impose as small a cost on society as possible.
The burden of taxes should be distributed fairly.
… …
tax system
zei seido
課税制度

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