ECON103 Chapter Notes - Chapter ECON103: Aggregate Demand

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2 May 2018
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Using Policy to Stabilize the Economy
ā€¢ Because monetary and fiscal policy can influence aggregate demand, the government
sometimes uses these policy instruments in an attempt to stabilize the economy. Economists
disagree about how active the government should be in this effort.
ā€¢ According to advocates of active stabilization policy, changes in attitudes by households and
firms shift aggregate demand; if the government does not respond, the result is undesirable
and unnecessary fluctuations in output and employment.
ā€¢ According to critics of active stabilization policy, monetary and fiscal policy work with such
long lags that attempts at stabilizing the economy often end up being destabilizing.
Example-1:
Suppose MPC = 2/3 and every $1 increase in government spending crowds out 50 cents of private
investment. If government spending is increased by $60 billion, what is the impact on aggregate
demand?
a. $20 billion
b. $10 billion.
c. $180 billion.
d. $90 billion.
Answer:
Multiplier = 1/(1-MPC) = 1/ (1-2/3) = 3
That means, $60 billion of government spending generates $180 billion (=$60 billion * 3) of
aggregate demand
Also, every $1 increase in government spending crowds out 50 cents of private investment.
Therefore, out of $180 billion, $90 billion will be crowded out for private investment, and other
$90 billion will be aggregate demand. (option D)
Example-2:
Suppose MPC = 3/4 and every $1 increase in government spending crowds out 50 cents of private
investment. If government spending is increased by $60 billion, what is the impact on aggregate
demand?
a. $120 billion
b. $30 billion.
c. $240 billion.
d. $180 billion.
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Document Summary

Using policy to stabilize the economy: because monetary and fiscal policy can influence aggregate demand, the government sometimes uses these policy instruments in an attempt to stabilize the economy. Suppose mpc = 2/3 and every increase in government spending crowds out 50 cents of private investment. If government spending is increased by billion, what is the impact on aggregate demand: billion, billion, billion, billion. Multiplier = 1/(1-mpc) = 1/ (1-2/3) = 3. That means, billion of government spending generates billion (= billion * 3) of aggregate demand. Therefore, out of billion, billion will be crowded out for private investment, and other. billion will be aggregate demand. (option d) Suppose mpc = 3/4 and every increase in government spending crowds out 50 cents of private investment. If government spending is increased by billion, what is the impact on aggregate demand: billion, billion, billion, billion.

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