1
Problem Set 3
MSU EC 410
Prof. Ahlin
due 11/10/15
1a. Use the Haugmented Solow model to determine the a) instantaneous impact on GDP per capita, b)
instantaneous impact on consumption per capita, c) longrun impact on GDP per capita, d) longrun impact on
consumption per capita, e) impact on longrun GDP per capita growth rate, and f) impact on longrun GDP
growth rate of a permanent and instantaneous increase in the fraction of national resources devoted to
investment in human capital, q. Assume the country begins at its steady state values of k*
and h*
before this
event occurs. Justify your answer by use of graph and/or equation.
1b. How does each answer compare to the answer the original Solow model would give when s increases,
both qualitatively (whether the amount goes up or down) and quantitatively (the amount by which it goes up or
down)?
2. Consider the Solow model with total factor productivity At constantly growing at rate g>0.
a. Determine the a) instantaneous impact on GDP per capita, b) instantaneous impact on consumption per
capita, c) longrun impact on GDP per capita (i.e. compare the level of GDP per capita with and without the
parameter change, in the longrun), d) longrun impact on consumption per capita (i.e. compare the level of
consumption per capita with and without the parameter change, in the longrun), and e) impact on longrun
GDP per capita growth rate of a onetime and instantaneous increase (jump) in productivity At, through a
significant and nonrepeatable invention. Assume the country begins at its “steady state value” of k*
before this
event occurs. Justify your answer by use of graph and/or equation. [Hint: this should not be considered a
change in g, since productivity resumes growth at rate g after the onetime jump; it should be modeled as a onetime
jump in At.]
b. Graph the path of yt and ct against time (or better yet, ln(yt) and ln(ct), which will be linear) for the event
analyzed in part a.
c. Repeat parts a&b for a permanent, instantaneous increase in the growth rate of productivity, g.
3. Growth Simulations. See PS3GrowthSimulationQuestion.xlsx posted on D2L. Fill in 200 years of data
using the HD model, the Solow model, and the HSolow model using the functions and parameters given in the
“GrowthCalculations” worksheet. The savings rate in all cases increases to 30% at year 25.
Specifically:
3.1. For the HD model, A=0.25, n=0.01, d=0.04, and s=0.2. Capital per person starts at $4000. Fill out k, y,
ln(y), c, ln(c), actual investment, breakeven investment, ?k, and gy for 200 years.
3.2. For the Solow model, f(k) = k
1/3
, A=50, n=0.005, d=0.02, and s=0.2. Capital per person starts at $8000.
Fill out k, y, c, actual investment, breakeven investment, ?k, and gy for 200 years.
3.3. For the HSolow model, f(k,h) = k
1/3h
1/3
, A=5, n=0.01, d=0.04, and s=0.2. Physical capital per person starts
at $4000, human capital per person starts at 2000. Fill out k, h, y, c, ?k, ?h, and gy for 200 years.
Note that in all cases, the savings rate s switches at 0.3 at the 25th year. Make sure to incorporate this in your
answers. [Hint: it will only affect the consumption formula and the actual investment column formula for the
HD and Solow models, and it will only affect the consumption formula and the ?k column formula for the HSolow
model.] [Hint: Of course, you need only specify each column’s formula once, then copy and paste down
the column for all the years. The formulas are pretty straightforward, and can be found by looking back at the
key equations for each model. It is simplest for actual investment not to recalculate income, but simply use the
fact that actual investment equals a fixed fraction of income, sy in the case of physical capital and qy in the case
of human capital.]
2
a. Give the income and consumption levels in year 200 for each of the three models. In which model is the
increase in s most effective? In which model is it least effective? Justify your answer.
b. Look at the graphs for the three models (which are in the other worksheets and should be filled out
automatically from the data you generate in the GrowthCalculations worksheet). Look at both HD graphs, but
focus on the one using logs. Discuss one significant way in which all three models’ graphs are similar. How do
the Solow and HSolow graphs differ?
4. Imagine that a bank will only lend if it can earn a rate of return of 6% on a loan. Further, imagine it
incurs administrative costs of $40 per loan it makes, regardless of the size of the loan. Throughout the problem,
assume for simplicity that the loans are all repaid with certainty, i.e. there is no risk.
a. If the bank makes five loans – of $100, $200, $500, $1000, and $10,000 – what are the respective
interest rates it must charge to break even on each loan?
b. Imagine the bank makes the same loans but must charge all borrowers the same interest rate. What
interest rate will it charge to break even overall? Which borrowers pay less, which pay more in this case than in
part a.? This practice of making losses on some loans and profits on others is called “crosssubsidization”.
c. How might competition between banks eliminate any one bank’s ability to crosssubsidize smaller
borrowers? Specifically, ci) could a rival lender lure away any of the customers of a bank carrying out the
policy of part b., and cii) how would this affect the ability to crosssubsidize of a bank carrying out the policy of
part b.?
d. It may not be accurate to assume that every loan incurs the same administrative cost, irrespective of size.
Larger loans may require more work. Redo part a. under the assumption that the administrative cost of a loan is
$40 per loan plus 1% of the size of the loan. (Thus a loan of $5000 would cost the bank $40 + 1%*$5000 =
$90, while a loan of $500 would cost the bank $40 + 1%*$500 = $45. The cost structure is still linear, but with
a positive intercept and slope.)
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