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EC140 Lecture Notes - Lecture 11: Output Gap, Aggregate Supply, Phillips Curve

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School
WLU
Department
Economics
Course
EC140
Professor
Ken Jackson

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EC140 Full Course Notes
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EC140 Full Course Notes
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Document Summary

Real gdp determined by intersection of supply and demand. Total output if all productive resources were fully employed independent of price level: fully employed resources does not mean unemployment in zero. Changes in potential output are long-run, not short-run. Potential gdp as an anchor economy returns to potential gdp after a shock. If real gdp < potential output: recessionary gap. If real gdp > potential output: inflationary gap. This causes the as curve to shift left. Higher wages lead to higher costs for all inputs. Inflationary gap resources are used beyond capacity overtime. Labour shortages emerge firms offer increased wages to attract/keep workers. This causes the as curve to shift right. Shifts end when real gdp equals potential output. Labour surpluses firms offer workers reduced wages. Lower wages lead to lower costs for other inputs. Recessionary gaps bring very slow wage adjustment: extensive research into why, behavioural responses by workers seem most likely.

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Related Questions

1. In the long run, when prices are perfectly flexible:

a. aggregate supply is vertical and a market economy is self-correcting.

b. a market economy cannot self-correct.

c. government will be required to set prices to maintain equilibrium.

d. changes in aggregate demand cause equilibrium real GDP to change.

 

2. An increase in household wealth when the SRAS curve is upward sloping:

a. leads to an increase in the price level but has no impact on real GDP

b. has no impact on the price level but leads to an increase in real GDP

c. leads to an increase in both the price level and real GDP

d. has no impact on the price level or real GDP

 

3. In the long run, continued increases in aggregate demand not matched by similar increases in aggregate supply will cause:

a. an increase in the full-employment level of real GDP

b. a recessionary gap

c. a decrease in the price level

d. an increase in the price level

 

4. The vertical long-run aggregate supply curve implies that:

a. changes in aggregate demand will not affect the price level

b. the short-run aggregate supply curve is also vertical

c. natural or full-employment real GDP does not depend on the price level, in the long run

d. natural or full-employment real GDP is the same as the equilibrium real GDP in the short run

 

5. A rightward shift of the long-run aggregate supply curve illustrates:

a. economic growth

b. a recessionary gap

c. an inflationary gap

d. a decrease in natural real GDP

 

6. When the economy is in a recessionary gap

a. there is a surplus of labor

b. there is a shortage of labor

c. it is producing a real GDP level that is greater than natural real GDP

d. the unemployment rate is less than the natural unemployment rate

 

7. If the actual unemployment rate is less than the natural unemployment rate:

a. a recessionary gap exists and wages are likely to rise

b. an inflationary gap exists and wages are likely to rise

c. a recessionary gap exists and wages are likely to fall

d. an inflationary gap exists and wages are likely to fall

 

8. An economy in long-run equilibrium is producing:

a. a level of real GDP that is greater than its natural real GDP

b. where both the price level and real output are maximized

c. a level of real GDP equal to its natural real GDP

d. in the vertical range of aggregate demand.

 

a) In the AD-AS model, stagflation does not persist, because the working of the self-correcting mechanism of the economy _____ the level of output and _____ the price level until the economy eventually returns to a long-run equilibrium state, where actual output _____ potential output.
decreases; decreases; falls short of
increases; decreases; equals
decreases; increases; exceeds
decreases; increases; equals
increases; decreases; exceeds
b) The LRAS curve is drawn as a vertical line at potential output (Y*) to indicate that
Y* is independent of the price level and that actual output Y > Y* in the long run
Y* equals actual output (Y) in the long run
Y* is independent of the price level and that actual output Y = Y* in the long run
Y* is independent of the price level
Y* is independent of the price level and that actual output Y < Y* in the long run
c) Stagflation arises in the context of the AD-AS model when some external factor causes
the LRAS curve to shift to the right
the AD curve to shift leftwards
the SRAS curve to shift downwards
the SRAS curve to shift upwards
the AD curve to shift rightwards
d) If the SRAS curve is positively sloped, then a decrease in the demand for Canadian-made goods in Europe will lead to _____ in the price level, in the short run.
either an increase or a decrease
no change
an increase
a decrease
an initial increase, and then a decrease
e) Which of the following will shift the aggregate demand curve to the right?
Consumers become pessimistic about the future
A new technology is developed that will increase profits
Income taxes are raised
Foreign economies fall into recession, reducing their demand for domestic exports
The government reduces purchases to balance the budget
f) Suppose a stock market crash decreases the stock of household wealth and therefore causes autonomous consumption to fall. Which of the following is the likely result?
A leftward shift the AD curve
There will be no movement of the AD curve
A movement down the AD curve
A movement up the AD curve
A rightward of the shift the AD curve
g) An economy is characterized by the AD equation P = 200 ? 0.02Y, SRAS equation P = 100 and LRAS equation Y* = 5000. In the absence of any change in policy or exogenous shocks, this economy will achieve a long-run price level of
100
110
120
90
105
h) The AD-AS model depicts a self-correcting economy. This means that the price level in the model adjusts automatically in response to a(n) _____ gap, so as to eliminate the _____ gap in the long run, without requiring any help from government policies.
recessionary; recessionary
recessionary; expansionary
expansionary; expansionary
output; output
expansionary; recessionary
i) The aggregate demand curve shows
the amount of planned aggregate expenditure (and output) at the current price level
the amount of planned aggregate expenditure (and output) at an average price level
the amount of planned aggregate expenditure (and output) at a constant price level
the amount of planned aggregate expenditure (and output) at various price levels
the amount of planned aggregate expenditure (and output) at last year's price level
j) Consider an economy initially at long-run equilibrium with output (Y) equal to potential output (Y*). If the SRAS is positively sloped, then a shift to the right of the AD curve will lead to _____ in the price level, in the short run. In the long run, the SRAS curve will shift to the _____ and the equilibrium will be at __________.
an increase; left; Y = Y*
a decrease; right; Y > Y*
an increase; right; Y = Y*
a decrease; left; Y > Y*
no change; left; Y = Y*

1) If actual (equilibrium ) real GDP is less than the full-employment, or natural, level of real GDP, then wages and other input prices are expected to:

a. fall and SRAS to shift to the left until long-run equilibrium is achieved.

b. fall and SRAS to shift to the right until long-run equilibrium is achieved.

c. rise and SRAS to shift to the left until long-run equilibrium is achieved.

d. rise and SRAS to shift to the right until long-run equilibrium is achieved.

2) In a self-regulating economy, inflationary gaps are automatically eliminated in the long run by:

a. decreases in wage rates that cause short-run aggregate supply to shift rightward.

b. decreases in wage rates that cause short-run aggregate supply to shift leftward.

c. increases in wage rates that cause short-run aggregate supply to shift rightward.

d. increases in wage rates that cause short-run aggregate supply to shift leftward.

3) Assume the economy is initially in equilibrium at the full-employment level of real GDP. If businesses and consumers become pessimistic regarding future economic conditions, ceteris paribus, the aggregate demand curve will shift to the ________, causing the level of output to ______.

a. left; fall

b. right; fall

c. left; rise

d. right; rise

4) Economists that advocate a macroeconomic policy of laissez-faire:

a. believe the economy is self-regulating only if the government intervenes to move the economy to equilibrium at natural real GDP.

b. believe the economy is self-regulating and will automatically move to equilibrium at natural real GDP in the long run.

c. also advocate central planning and government control of resources.

d. also advocate active government intervention in the economy.

5) Which of the following summarizes the process for closing a recessionary gap if the economy is self-regulating?

a. Labor shortages put upward pressure on wages, which leads to higher costs of production and a decrease in short-run aggregate supply.

b. Labor shortages put downward pressure on wages, which leads to increases in employment and spending and an increase in aggregate demand.

c. Unemployed resources put upward pressure on the price level, which leads to higher wages, increases in spending, and increases in aggregate demand.

d. Unemployed resources put downward pressure on the price level, which leads to lower costs of production and an increase in short-run aggregate supply.