Macroeconomics - Aggregate demandaggregate supply 1 The AD-AS
model has become the standard textbook model for explaining the
macroeconomy. This model shows the price level and level of real
output given the equilibrium in aggregate demand and aggregate
supply. The aggregate demand curve's downward slope means that more
output is demanded at lower price levels.
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Slide 3
Aggregate demand 1 The aggregate demand curve is in fact
downward sloping as a result of three distinct effects: Pigou
effect|Pigou's wealth effect, Keynes effect|the Keynes' interest
rate effect and the MundellFleming model|Mundell-Fleming
exchange-rate effect
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Slide 4
Aggregate demand 1 The aggregate demand curve illustrates the
relationship between two factors - the quantity of output that is
demanded and the aggregated price level
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Slide 5
Aggregate demand 1 If the money supply was increased and thus
aggregate demand increased, there would be a movement up along the
Long run aggregate supply curve. The cost of this is a permanently
higher level of prices. As a result of increase in aggregate
demand, the economy will gravitate toward the natural level more
quickly.
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Slide 6
Aggregate demand - History 1 First, he argued that with a lower
effective aggregate demand, or the total amount of spending in the
economy (lowered in the Crash), the private sector could subsist on
a permanently reduced level of activity and involuntary
unemployment, unless there was active intervention
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Slide 7
Aggregate demand - Components 1 An aggregate demand curve is
the sum of individual demand curves for different sectors of the
economy. The aggregate demand is usually described as a linear sum
of four separable demand sources:
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Slide 8
Aggregate demand - Components 1 (Inventory accumulation would
correspond to an excess supply of products; in the National Income
and Product Accounts, it is treated as a purchase by its producer.)
Thus, only the planned or intended or desired part of investment
('Ip') is counted as part of aggregate demand
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Slide 9
Aggregate demand - Components 1 This shifts the aggregate
demand curve to the left
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Slide 10
Aggregate demand - Components 1 In sum, for a single country at
a given time, aggregate demand ('D' or 'AD') = 'C' + 'Ip' + 'G' +
'(X-M)'.
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Slide 11
Aggregate demand - Aggregate demand curves 1 Understanding of
the aggregate demand curve depends on whether it is examined based
on changes in demand as income changes, or as price change.
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Slide 12
Aggregate demand - Aggregate demand-aggregate supply model 1
Sometimes, especially in textbooks, aggregate demand refers to an
entire demand curve that looks like that in a typical Marshallian
demand|Marshallian supply and demand diagram.
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Slide 13
Aggregate demand - Aggregate demand-aggregate supply model 1
Carefully using ideas from the theory of supply and demand,
aggregate supply can help determine the extent to which increases
in aggregate demand lead to increases in real output
(economics)|output or instead to increases in prices (inflation).
In the diagram, an increase in any of the components of 'AD' (at
any given 'P') shifts the 'AD' curve to the right. This increases
both the level of real production ('Y') and the average price level
('P').
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Slide 14
Aggregate demand - Debt 1 A Post-Keynesian theory of aggregate
demand emphasizes the role of debt, which it considers a
fundamental component of aggregate
demand;[http://www.debtdeflation.com/blogs/2009/12/
01/debtwatch-no-41-december-2009-4-years-of- calling-the-gfc/
Debtwatch No 41, December 2009: 4 Years of Calling the GFC], Steve
Keen, December 1, 2009 the contribution of change in debt to
aggregate demand is referred to by some as
the.[http://ssrn.com/paper=1595980 Credit and Economic Recovery:
Demystifying Phoenix Miracles], Michael Biggs, Thomas Mayer,
Andreas Pick, March 15, 2010 Aggregate demand is spending, be it on
consumption, investment, or other categories
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Slide 15
Aggregate demand - Debt 1 Since write-offs and savings rates
both spike in recessions, both of which result in shrinkage of
credit, the resulting drop in aggregate demand can worsen and
perpetuate the recession in a vicious cycle.
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Slide 16
Aggregate demand - Debt 1 Indeed, a fall in the level of debt
is not necessary even a slowing in the rate of debt growth causes a
drop in aggregate demand (relative to the higher borrowing
year).However much you borrow and spend this year, if it is less
than last year, it means your spending will go into recession
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Slide 17
Aggregate demand - Criticisms 1 Austrian School|Austrian
theorist Henry Hazlitt argued that aggregate demand is a
meaningless concept in economic analysis. Friedrich Hayek, another
Austrian, argued that Keynes' study of the aggregate relations in
an economy is fallacious, as recessions are caused by
micro-economic factors.
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Slide 18
Effective aggregate demand 1 The aggregate demand curve is
plotted with real gross domestic product|real output on the
horizontal axis and the price level on the vertical axis
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Slide 19
Effective aggregate demand 1 Aggregate demand is expressed
contingent upon a fixed level of the real versus nominal value
(economics)|nominal money supply
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Slide 20
Effective aggregate demand 1 According to the ADAS
model|aggregate demand-aggregate supply model, when aggregate
demand increases, there is movement up along the aggregate supply
curve, giving a higher level of prices.Mankiw, N. Gregory, and
William M. Scarth. Macroeconomics. Canadian ed., 4th ed. New York:
Worth Publishers, 2011. Print.
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Slide 21
Pigou effect - Integration with Keynesian Aggregate Demand 1
Keynes argued that a drop in aggregate demand could lower
employment and, simultaneously, the price level; an occurrence
observed in the deflationary Great depression|depression). In the
IS-LM framework of Keynesian economics, as formalized by John
Hicks, a negative aggregate demand shock would shift the LM curve
left due to rising real wages changing liquidity preference. The
Pigou effect would counterbalance this by shifting the IS curve
right due to rising real balances raising expenditures.
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Slide 22
AD-AS model - Aggregate demand curve 1 The Aggregate demand
curve AD, which is downward sloping, is derived from the IS/LM
model.
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Slide 23
AD-AS model - Aggregate demand curve 1 The real money supply
has a positive effect on aggregate demand, as does real government
spending (meaning that when the independent variable changes in one
direction, aggregate demand changes in the same direction); the
exogenous component of taxes has a negative effect on it.
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Slide 24
AD-AS model - Shifts of aggregate demand and aggregate supply 1
The following summarizes the exogenous events that could shift the
aggregate supply or aggregate demand curve to the right. Exogenous
events happening in the opposite direction would shift the relevant
curve in the opposite direction.
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Slide 25
AD-AS model - Shifts of aggregate demand 1 The following
exogenous events would shift the aggregate demand curve to the
right. As a result, the price level would go up. In addition if the
time frame of analysis is the short run, so the aggregate supply
curve is upward sloping rather than vertical, real output would go
up; but in the long run with aggregate supply vertical at full
employment, real output would remain unchanged.
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Slide 26
AD-AS model - Shifts of aggregate demand 1 Rightward aggregate
demand shifts emanating from the IS curve:
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Slide 27
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