Let's assume that a country - the Kingdom of Hogwarts - grows following the Solow growth model. The country has a Cobb-Dougla as Y = AKO.5L0.5. In this economy, the fraction of output invested (saved), s, is equal t

Exploring Economics
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Author:Robert L. Sexton
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Chapter20: Economic Growth In The Global Economy
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1. Let's assume that a country - the Kingdom of Hogwarts - grows, by some magic, exactly
following the Solow growth model. The country has a Cobb-Douglas production function such
as
Y = AK0.5 L0.5.
In this economy, the fraction of output invested (saved), s, is equal to 0.25, annual growth rate
of population (labor force) is 0.02, and the depreciation rate of the capital stock is 0.03 per
year.
(1) Assume that there is no technology progress, and the level of technology (A) is always equal
to one. Suppose that this economy's initial capital stock per capita (labor) (k =) at the
%3D
year t=0 is equal to 4. Calculate the economy's per capita capital stock, per capita output,
and growth rates of per capita capital and output at the year t=1 and at the steady state.
Explain how they change over time graphically.
(2) Assume all of sudden the investment rate, s, increases to 0.5, with all other conditions being
the same as the country in (1). Calculate steady-state levels for capital and output per capita.
(3) Compare two different steady states between low saving rate (0.25) and high saving rate
(0.5). Which one do you think is better? Let's assume that the “best" steady state has the
highest possible consumption per person in the steady state: c* = (1 – s)Aƒ (k*). Why
doesn’t a higher saving rate necessarily lead to a better steady state?
Transcribed Image Text:1. Let's assume that a country - the Kingdom of Hogwarts - grows, by some magic, exactly following the Solow growth model. The country has a Cobb-Douglas production function such as Y = AK0.5 L0.5. In this economy, the fraction of output invested (saved), s, is equal to 0.25, annual growth rate of population (labor force) is 0.02, and the depreciation rate of the capital stock is 0.03 per year. (1) Assume that there is no technology progress, and the level of technology (A) is always equal to one. Suppose that this economy's initial capital stock per capita (labor) (k =) at the %3D year t=0 is equal to 4. Calculate the economy's per capita capital stock, per capita output, and growth rates of per capita capital and output at the year t=1 and at the steady state. Explain how they change over time graphically. (2) Assume all of sudden the investment rate, s, increases to 0.5, with all other conditions being the same as the country in (1). Calculate steady-state levels for capital and output per capita. (3) Compare two different steady states between low saving rate (0.25) and high saving rate (0.5). Which one do you think is better? Let's assume that the “best" steady state has the highest possible consumption per person in the steady state: c* = (1 – s)Aƒ (k*). Why doesn’t a higher saving rate necessarily lead to a better steady state?
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