1. Consider the Solow model with total factor productivity A, constantly growing at rate g>0. a. Determine the a) instantaneous impact on GDP per capita, b) instantaneous impact on consumption per capita, c) long-run impact on GDP per capita (i.e. compare the level of GDP per capita with and without the parameter change, in the long-run), d) long-run impact on consumption per capita (i.e. compare the level of consumption per capita with and without the parameter change, in the long-run), and e) impact on long-run GDP per capita growth rate of a one-time and instantaneous increase (jump) in productivity At, through a significant and non- repeatable invention, after which At immediately resumes growth at rate g. 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 is not a change in g, since productivity resumes growth at rate g after the one-time jump; it is a one-time jump in At.] b. Graph the path of ln(yt) and ln(c) against time for the event analyzed in part a. c. Repeat parts a&b for a permanent, instantaneous increase in the growth rate of productivity, g. Treat this simply as an increase in trend growth with no change in the "steady

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1. 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) long-run impact on GDP per capita (i.e. compare the level of GDP per
capita with and without the parameter change, in the long-run), d) long-run impact on
consumption per capita (i.e. compare the level of consumption per capita with and without the
parameter change, in the long-run), and e) impact on long-run GDP per capita growth rate of a
one-time and instantaneous increase (jump) in productivity At, through a significant and non-
repeatable invention, after which At immediately resumes growth at rate g. 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 is not a change in g, since productivity resumes growth at rate
g after the one-time jump; it is a one-time jump in At.]
b. Graph the path of ln(y+) and ln(c+) against time for the event analyzed in part a.
c. Repeat parts a&b for a permanent, instantaneous increase in the growth rate of
productivity, g. Treat this simply as an increase in trend growth with no change in the “steady
state" value of k or y. It may help to do the graphs against time first, and use those to answer the
a)-e) impacts.
Transcribed Image Text:1. 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) long-run impact on GDP per capita (i.e. compare the level of GDP per capita with and without the parameter change, in the long-run), d) long-run impact on consumption per capita (i.e. compare the level of consumption per capita with and without the parameter change, in the long-run), and e) impact on long-run GDP per capita growth rate of a one-time and instantaneous increase (jump) in productivity At, through a significant and non- repeatable invention, after which At immediately resumes growth at rate g. 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 is not a change in g, since productivity resumes growth at rate g after the one-time jump; it is a one-time jump in At.] b. Graph the path of ln(y+) and ln(c+) against time for the event analyzed in part a. c. Repeat parts a&b for a permanent, instantaneous increase in the growth rate of productivity, g. Treat this simply as an increase in trend growth with no change in the “steady state" value of k or y. It may help to do the graphs against time first, and use those to answer the a)-e) impacts.
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