1. AP Microeconomics Unit 5: The Role of Government
12-18% of AP Micro Exam
Unit Exam: 1/13 & 1/14

2. What is the difference between a public good and a private good?
Exclusion (denied access unless you pay) vs. Non-Exclusion (everyone can use, cannot exclude benefits for those who do not pay)
Public Good: Shared consumption (nonrivalrous) One person’s consumption of a good does not reduce the usefulness to others
vs.
Non-shared consumption (rival good)
A true public good is non-rival (shared consumption) and non-excluding

3. Some Examples Hamburger: Exclusion & Rival TV Show:
Exclusion but Nonrival
Park:
Nonexclusion and Nonrival
College Education
National Defense

4. Someone who uses the good but doesn’t pay for it.
What is a free-rider?
Someone who uses the good but doesn’t pay for it.
Free riders occur when there are non-exclusion and shared consumption (public goods)
Spraying for mosquitoes
Police & fire protection
National defense
Street lights

5. Externality
When one’s actions impose a cost or benefit on the well-being of a 3rd party.
Externalities result in market failure.

6. 1) Positive: external benefit is imposed on someone (CASUES UNDERPRODUCTION) (examples: gardens, restored historic buildings, research)
2) Negative: external cost is imposed on someone (CAUSES OVERPRODUCTION) (examples: exhaust from autos, barking dogs, noise from airplanes)

7. Let’s See What You Got…
From memory, create a detailed correctly labeled graph detailing a positive externality. Accurately label all curves and deadweight loss.
Now draw a negative externality graph. Follow the above instructions.

8. January 8, 2013 Review parts A,B,C from packet
Notes: Per-Unit or Lump Sum Tax/Subsidy to correct externalities & the Coase Theorem
HW: Parts D and E from Activity 5-2 (tax/subsidy) and all of Activity 5-3 (Coase Theorem)

9. Profit-Maximizing Firm in Perfect Competition
Taxes and Subsidies
Per-Unit vs. Lump-Sum
Parallel logic between subsidies and taxes.
Per-Unit policies affect firm’s MC, so output would be affected.
Per-Unit policies also affect AVC and ATC curves by shifting them upward.
AFC not affected!
Per-Unit policies lessen output and quantity
Lump-Sum policies affect firms TFC curves, therefore affecting AFC and ATC curves.
Firm’s output (MR=MC) remains the same!
Lump-Sum policies reduce firm’s total profit but do not reduce quantity.
Profit-Maximizing Firm in Perfect Competition

10. Coase Theorem Remember, externalities lead to inefficiency…
Can disputes causes by externalities be solved privately?
The proposition that, in a conflict of property rights, if private parties can bargain without cost over the allocation of resources, they can solve the problem of externalities on their own.

11. January 9, 2014
Review HW (Activity 5-2 parts D and E and Activity 5-3 on Coase Theorem)
Continue Unit 5 Notes: Taxation
HW: All of Activities 5-4 (Economic Efficiency dealing with Externalities), 5-5 (Taxation) and 5-6 (Income Tax)

12. 2 Principles of Taxation
Benefits-Received Principle
Those who benefit for services provided by the government should be the ones who pay for it
VS.
Ability-to-Pay Principle
Individuals/Businesses with larger incomes should pay more taxes.

13. Tax Classification 3 of them:
Progressive: Person with higher income pays larger % of income in taxes than person with smaller income. (Income tax)
Proportional: Everyone pays same % of income in taxes regardless of income.
Regressive: Person with lower income pays larger % of their income in taxes than person with higher income (gas tax, sales tax)
Tax Incidence: Reveals which group, the consumers or producers, will pay the price of a new tax. 
When supply is more elastic than demand, the tax burden falls on the buyers. If demand is more elastic than supply, producers will bear the cost of the tax.
Example: the demand for cigarettes is fairly inelastic, which means that despite changes in price, the demand for cigarettes will remain relatively constant. Let's imagine the government decided to impose an increased tax on cigarettes. In this case, the producers may increase the sale price by the full amount of the tax. If consumers still purchased cigarettes in the same amount after the increase in price, it would be said that the tax incidence fell entirely on the buyers.

14. January 10, 2013
Finish Unit 5 Notes: Income Inequality and the Lorenz Curve
Last AP Micro Assignment: Activity 5-7
Q & A/Review HW, etc.

15. Income Inequality and Distribution of Wealth

16. How does the government measure distribution of income?
Income Inequality
Some households earn more income than others…
In 2012, the average American earns roughly $52,000.
What’s wrong with using the average?
How does the government measure distribution of income?

17. The LAST AP Micro graph to learn!!!!
THE LORENZ CURVE
The LAST AP Micro graph to learn!!!!

18. The Lorenz Curve Perfect Equality Percent of Income
100 80 60 40 20
Perfect Equality
Percent of Income
Percent of Families

19. The Lorenz Curve Lorenz Curve (actual distribution) Perfect Equality
100 80 60 55 40 30 20 15 5
Lorenz Curve
(actual distribution)
Perfect Equality
Percent of Income
Percent of Families

20. The size of the banana shows
The Lorenz Curve
100 80 60 55 40 30 20 15 5
Lorenz Curve
(actual distribution)
Perfect Equality
Percent of Income
The size of the banana shows
the degree of
income inequality.
Percent of Families 20

21. The banana gets smaller when the government re-distributes income
The Lorenz Curve
100 80 60 55 40 30 20 15 5
After Distribution
Perfect Equality
Percent of Income
The banana gets smaller when the government re-distributes income
Percent of Families 21

22. Gini Coefficient The Gini coefficient is equal to the area marked A
divided by the sum of the areas marked A and B.
that is, Gini = A / (A + B).
Gini Coefficient

23. YOU ARE DONE WITH AP MICRO!!!!
GREAT NEWS…
YOU ARE DONE WITH AP MICRO!!!! 23