Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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![Solow Model
Consider a Solow growth model like the one discussed in class, but incorporating the
possibility of less than full employment. Let t denote a period. The production function is
Y; = zK; [e,L]*¬,
so that given the current TFP z4, the capital input K, and the labor input N = eL, firms
produce output Y; in period t. Here e € [0, 1] denotes the proportion of the labor force L
that is employed at each point in time. If e = 1 the economy is at full employment, with
e = 0, on the other hand, everyone is unemployed. Total resources satisfy
Y; = C; + I,
where C; denotes aggregate consumption, I aggregate investment, and Y; is GDP. Assume
that people invest a constant proportion s of their income, so that aggregate investment
satisfies
It = sY;
and capital evolves according to
K+1 = K,(1 – 8) + I,
%3D
where ổ denotes depreciation. This function tells us how capital next period is related to
current capital, investment, and depreciation. In the book, you have seen the expression
written as
AK = I – 8K,
note that the two are equivalent.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F992c8c15-027c-4c4f-9afa-4b2b8b2073f2%2F87c6312e-b342-4fc6-9ffd-af45ad43501a%2Fyo4qqfz_processed.png&w=3840&q=75)
Transcribed Image Text:Solow Model
Consider a Solow growth model like the one discussed in class, but incorporating the
possibility of less than full employment. Let t denote a period. The production function is
Y; = zK; [e,L]*¬,
so that given the current TFP z4, the capital input K, and the labor input N = eL, firms
produce output Y; in period t. Here e € [0, 1] denotes the proportion of the labor force L
that is employed at each point in time. If e = 1 the economy is at full employment, with
e = 0, on the other hand, everyone is unemployed. Total resources satisfy
Y; = C; + I,
where C; denotes aggregate consumption, I aggregate investment, and Y; is GDP. Assume
that people invest a constant proportion s of their income, so that aggregate investment
satisfies
It = sY;
and capital evolves according to
K+1 = K,(1 – 8) + I,
%3D
where ổ denotes depreciation. This function tells us how capital next period is related to
current capital, investment, and depreciation. In the book, you have seen the expression
written as
AK = I – 8K,
note that the two are equivalent.

Transcribed Image Text:1. Assuming that z4 = z and e = e are constant, compute the steady state value of
capital per capita k* for this economy as a function of all the parameters of the
model. Remember that capital per capita satisfies k = 4, and that you will need to
transform all variables into per capita terms.
2. Let z4 = 1.3, s = 0.3, a = 0.35, e = 1 and ô = 0.07. What is the value of capital in
the steady state? Denote it by k*.?
3. Does this value of s satisfy the golden rule? If yes, explain. If not, compute the value
of s that would.
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