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ECON 222 Macroeconomics
Exam I: Building blocks and long-run model
Name: ____________________
Spring 2020 Make-up
Consider an economy with the following parameters:
Production: Z = 40, K = 4,000, ρ = 4, N = 121, α = 0.3, δ = 0.35, γ = 0.35
Government: G = 400, t = 20%
Consumption: C0 = 200, CY = 0.75
Imports: IMY = 0.1
Exchange rate: ε0 = 110, εr = 700, r f = 5%
Gross exports: GXY = 0.02, Y f = 3,000, GXε = 1
Investment: I0 = 300, Ir = 1,200
1. Solve the model. All dollar quantities can be rounded to no decimal places. The interest rate
should be shown to two decimal places (e.g., 3.45%, or 0.0345). [10 pts]
Y =
T =
R =
C =
S (private) =
S (public) =
IM =
r =
GX =
I =
2. Now consider a situation where there is a large increase in the resource supply.
Simultaneously, there is a decrease in Z, down to a new level of 38 and an increase in ρ up to
a new level of 4.5. The net effect on the quantity of labor from increased resource supply
and decreased Z is that the employment level rises to 128.
Solve the model. The same rounding guidelines apply as in question 1. [10 pts]
Y =
T =
R =
C =
S (private) =
S (public) =
IM =
r =
GX =
I =
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3. On the diagram below move any curves that need to be moved to reflect the situation in
question 2 (increased supply of resources, decreased level of Z, increased level of ρ). Explain
why you’re moving any curve(s) that you move. If any shifts are ambiguous (you could make
an argument for them going either way), note that. Note: since question 2 specifies that the
equilibrium labor input goes up, be sure to draw your curves such that you end up with N2 >
N1 . [10 pts]
4. Why might the increase in resource supply actually be a cause (over enough time) of the
decline in Z a nd increase in ρ? (5 pts)
5. On the diagram below, treat the printed lines as depicting the situation in question 1. Draw
new lines based on your results from question 2. (They don’t have to be quantitatively
accurate, but they should be qualitatively in line with the way your answers in question 2
differed from your answers in question 1—that is, everything should move in the right
direction, but the exact distance is not important). Label the new interest rate r2 and the new
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level of investment I2 . Indicate the quantity of international saving in the question-2 situation
(in other words, the quantity that is shown by your new lines). [8 pts]
6. (Don’t show this on the diagram above.) How would you expect increased resource supply
in question 2 to affect the investment demand? Explain. [5 pts]
7. If investment demand changed in the way you said in question 6, how would that affect the
interest rate? [3 pts]
8. If investment demand changed the way you said in question 6, how would that affect the
trade balance? [3 pts]
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9. In the data chart below, what is happening to the U.S. trade balance? [2 pts]
10. What change in ε0 would tend to cause the effects seen in the data above? Explain the
mechanism (i.e., how would your answer about the change in ε0 lead to the effects seen in the
chart?). [5 pts]
11. What change in IMY would tend to cause the effects seen in the data above? Explain the
mechanism (i.e., how would your answer about the change in IMY lead to the effects seen in
the chart?). [5 pts]
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