AP Macro Review
Fun with formulas!
Unemployment
EMPLOYED
8000
UNEMPLOYED
1000
NOT IN THE LABOR FORCE (16 -64)
500
According to the chart above,
1. What is the unemployment rate?
2. What is the size of the labor force ?
3. What is the labor force participation rate?
Real and nominal interest rates
• Jerry decides to loan his friend some money.
He would like to see a 5% return on the loan.
If the current rate of inflation is 15%, what
should he charge as an interest rate?
GDP
• 1. Suppose GDP is $15 million, where
consumer spending is $4 million, investments
are $2 million, government spending is $5
million, and exports are $4 million. How much
is spent on imports?
Rule of 70
• If the US has a 2% annual growth rate, how
long will take for real GDP to double?
Real v. nominal GDP
• Current GDP is $8000
• The GDP deflator is 110
• What is real GDP?
• Real GDP in the previous year was $7000
• What was the rate of growth in this economy?
Inflation
• CPI in 1990 was 115
• CPI in 1991 was 120
• What was the inflation rate between the two
years?
• If I got a 2% raise between in this time period,
what happened to my real income?
FRQ PRACTICE
• 2011, question B
The multiplier
• MPC = change in consumption/change in disposable
income
• MPS= change in savings/change in disposable income
• MPC + MPS =1
• Spending multiplier = 1/MPS
• Tax multiplier = - MPC/MPS
• Balanced budget multiplier =1 (used to offset the
multiplier effect on increased spending by increasing
taxation by the same amount as the spending increase
The multiplier
• If the government increases spending by $5
billion and the MPC is .7, what would happen
to real GDP?
• A. increase by $15 billion
• B. Increase by $16.5 billion
• C. Decrease by $16.5 billion
• D. Decrease by $15 billion
• E. Remain the same
The multiplier
• If the MPC is .6 and spending increases by $10
billion, what will happen to GDP?
The multiplier
• If the MPC is .6, how much would the
government need to spend if it desired an $25
billion increase in national income?
The multiplier
• MPC = .75
What is the spending multiplier?
What is the tax multiplier?
What will be the effect on GDP if spending and
taxes both increase by $10 billion?
The money multiplier
• The required reserve ratio (RRR) is 10%.
• What is the multiplier?
• If a bank receives a cash deposit of $10,000,
what is the amount of excess reserves that
results from this deposit?
• What is the change in loans that results from
this deposit?
FRQ Practice
In Country Z, the required reserve ratio is 10 percent. Assume that
the central bank sells $50 million in government securities on the
open market.
• (a) Calculate each of the following.
• (i) The total change in reserves in the banking system
• (ii) The maximum possible change in the money supply
• (b) Using a correctly labeled graph of the money market, show the
impact of the central bank’s bond sale
• on the nominal interest rate.
• (c) What is the impact of the central bank’s bond sale on the
equilibrium price level in the short run?
• (d) As a result of the price level change in part (c), are people with
fixed incomes better off, worse off, or unaffected? Explain.
Assume that the real interest rates in both Canada and India
have been 5 percent. Now the real interest rate in India
increases to 8 percent.
• (a) Using a correctly labeled graph of the foreign exchange
market for the Canadian dollar, show the effect of
• the higher real interest rate in India on each of the
following.
• (i) Supply of the Canadian dollar. Explain.
• (ii) The value of the Canadian dollar, assuming flexible
exchange rates
• (b) Using a correctly labeled graph of the loanable funds
market in Canada, show how the increase in the real
• interest rate in India affects the real interest rate in Canada.
T-account
Assets : reserves, loans
Liabilites : demand deposits/checking accounts
Example on whiteboard
AS/AD curves
• There are three of these that you need to be
able to operate.
• They work much like regular supply and
demand but they look at the entire economy.
• P is now PL, and Q is now
GDP/Output/Income/Y
• EXAMPLES ON BOARD
Phillips Curve
• Relationship between the EVIL TWINS of
economics, inflation and unemployment
• In the SHORT RUN, there does seem to be an
inverse relationship
• In the LONG RUN, there is none---the LRPC is
vertical from the point of the natural rate of
unemployment.
• IT IS THE MIRROR IMAGE OF AGGREGATE SUPPLY
• EXAMPLES ON THE BOARD
Practice
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1. Assume that the economy of Meekland is in a long-run equilibrium with a balanced government budget.
(a) Using a correctly labeled graph of aggregate supply and aggregate demand, show each of the following.
(i) Long-run aggregate supply
(ii) The output level, labeled YE, and the price level, labeled PLE
(b) Assume consumer confidence falls. Show on your graph in part (a) the short-run impact of the change
in consumer confidence and label the new equilibrium price level and output Y1 and PL1, respectively.
(c) Using a correctly labeled graph of the short-run and long-run Phillips curves, show the effect of the fall
in consumer confidence on inflation. Label the initial long-run equilibrium point A and the new short-run
equilibrium point B.
(d) If the government and the central bank do not pursue any discretionary policy change, how does the
fall in consumer confidence affect government transfer payments in Meekland? Explain.
(e) Draw a correctly labeled graph of the loanable funds market in Meekland and show the effect of the
change in government transfer payments you identified in part (d) on the real interest rate.
(f) In the absence of any changes in fiscal and monetary policies, in the long run will the short-run
aggregate supply curve shift to the left,
Money Market
• Relationship between interest rates and the
quantity of money
• Demand for money is downward-sloping,
because we demand less at higher rates, and
more at lower rates
• Money supply is vertical, because it is
manipulated by the Fed
• Example on board
Loanable funds graph
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Supply and demand graph---loanable funds
P=interest rate
Q= QLF
Example on board
Laffer curve
• Relationship between tax rate and tax revenue
• At a certain point, if tax rates are too high, tax
revenue will actually decrease because
incentive has been removed
• Example on board