EC140 Lecture Notes - Lecture 6: Diminishing Returns, Aggregate Supply, Economic Equilibrium

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4 Apr 2016

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Learning objecives: explain why an exogenous change in price level shits the ae curve, derive the ad curve, describe the meaning of the as curve, explain how ad and as shocks afect equilibrium price and real gdp. Change in price level changes ae curve. Equilibrium pairs of price level, real gdp. Non-price factors that shit ae curve, shit ad curve. Openness and the slope of the ad curve. Price level change has a larger efect on output. With upward sloping as curve, value of the muliplier is reduced. Increasing producion causes increases in costs, irms face diminishing returns of scale. When output is low, easy to expand. When output is high, hard to further expand. Increasing slope of the as curve afects the muliplier. When output is low the muliplier is close to the simple muliplier (in. When output is high the muliplier is smaller than the simple muliplier (maybe less than 1)

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10,A change in the price levelâ ________ the AE curve andâ ________ the AD curve.

âshifts; shifts

has no effectâ on; results in a movement along

results in a movementâ along; results in a movement along

results in a movementâ along; shifts

âshifts; results in a movement along

17,When the price levelâ falls, the aggregate planned expenditure curve shiftsâ ________, equilibrium expenditureâ ________ and there is a movementâ ________ along the aggregate demand curve.

âupward; increases; upward

âdownward; decreases; downward

âupward; decreases; downward

âupward; increases; downward

âdownward; increases; upward

21,Which of the following increases the size of the expenditureâ multiplier?

an increase in autonomous spending

a decrease in the marginal propensity to consume

a decrease in the marginal propensity to import

an increase in the marginal income tax rate

an increase in investment

23,If the quantity of real GDP demanded is greater than the quantity of real GDPâ supplied, then

the price level falls and firms decrease production.

aggregate demand changes to restore equilibrium.

the economy must be producing at potential GDP.

the price level falls to restore the macroeconomic equilibrium

the price level rises and firms increase production.

24, ________ can trigger an expansion.

Equality between aggregate expenditure and real GDP

A decrease in induced expenditure

A downward shift of the AE line

An increase in autonomous expenditure

A decrease in autonomous expenditure

greyarmadillo136

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

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

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

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

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

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

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

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

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

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 the price level doubles and the real output doesn't change, then nominal output also doubles.
2. Inflation makes it less difficult to interpret the information conveyed by prices.

3. Laissez-faire economists oppose government intervention in the market process.

4. Active demand management policies are based on the work of JohnMaynard Keynes.

5. In the AS/AD model, as the price level rises, the real value of assets increases, causing consumption to increase. This is one reason why the aggregate demand curve slopes down.

6. The short-run aggregate supply curve is upward sloping in part because increases in aggregate demand cause some firms to increase their price markups.

7. If productivity and wages both raises by 3 percent, then the short-run aggregate supply curve does not shift.

8. The long-run aggregate supply curve is vertical because all prices adjust in the long run.

9. If the economy is not in long-run equilibrium and other things are equal, then prices will eventually adjust to bring the economy to long-run equilibrium.

10. Most economists agree that it is possible for fiscal policy to fine-tune the economy.

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EC140 Lecture Notes - Lecture 6: Diminishing Returns, Aggregate Supply, Economic Equilibrium

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