econ ch 10
Economics 104 with Russell at University of Massachusetts, Amherst
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By: Brooke Levey
Created: 2010-11-08
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Created: 2010-11-08
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GDP =aggregate
income
Aggregate expenditure
line =a relationship tracing for a given price level spending at each level
of income or real GDP
·
Real GDP=horizontal axis, aggregate expenditure
on vertical
·
Only spending component that varies with real
GDP is consumption and consumption only varies with income
·
AE line=MPC
Income expenditure
model =relationship that shows how much people plan to spend at each income
level; identifies for a given price level where the amount people plan to spend
equals the amount produced in the economy
What if spending exceeds real GDP:
·
When the amount people want to spend exceeds the
amount produced, inventories have to give
·
Because firms cant draw down inventories
indefinitely, inventory reduction prompt firms to produce more output which
increases employment and consumer income, leading to more spending. As long as
spending exceeds output, firms increase production to make up the difference
·
This process of more output, more income and
more spending continues until spending equals real GDP
What if real GDP exceeds spending?
·
If real GDP exceeds spending, unsold goods
accumulate and swells inventories more than firms planned
·
Firms thus cut production, which reduced
employment and income
·
Unplanned inventory buildups cause firms to cut
production until the amount they produce equals aggregate spending=real GDP
The simple spending multiplier:
·
An increase in spending:
o
Upward shift of the AE line while real GDP
demanded increases as well
o
Real GDP can be thought of as both the value of
production and the income arising from that production. Production yields
income, which generates spending.
o
We can think of each trip around the circular
flow as a round of income and spending:
§ Round
one: upward shift of the AE line, spending exceeds output. Firms match this
increased investment spending by an unplanned reduction in inventories
§ Round
two: spending increase leads to firms increasing their output and is seen by
income increases real GDP
§ Round
three: 4/5 of the money earned in round 2 will get spent during round three,
while 1/5 is saved. The added spending causes firms to to increase output
§ As
long as spending exceeds output, production increases, thereby creating more
income, which generates still more spending
o
Simple spending multiplier is the factor by
which real GDP demanded changes for a given initial change in spending
§ Simple
spending multiplier-1/(1-MPC)
The aggregate demand curve:
·
A higher price level:
o
decreases the real value of these money
holdings. This cuts consumer wealth, making people less willing to spend at
each income level. It also tends to increase the market interest rate, which
reduces investment and also foreign goods become cheaper for US consumers and
US goods become more expensive abroad
o
Imports rise and exports fall, decreasing net
exports
o
Reduce aggregate spending which reduces real GDP
demanded
·
A lower price level:
o
The value of bank accounts, currency and other
money holdings increases.
o
Consumers are wealthier and thus spend more to
each real GDP
o
Decreases the market interest rate which
increases investment
o
Makes US products cheaper abroad and foreign
products more expensive here so exports increase, imports decrease and next
exports increases
The multiplier and shifts in the aggregate demand:
·
While price level remains constant; An increase
in investment shifts the aggregate expenditure line up and because of the mult
effect, real GDP demanded goes up and the aggregate demand curve shifts to the
right
BIG PICTURE: for a given price level,
the aggregate expenditure line relates spending plans to income or real GDP.
Real GDP demanded is found where the amount people plan to spend equals the
amount produced. A change in the price level shifts the aggregate expenditure
line, changing real GDP demanded. Changes in the price level and consequent
changes in real GDP demanded generate points along an aggregate demand curve
but at a given price level, changes in spending plans, such as changes in
investment, consumption, or government purchases, shifts the aggregate demand
curve.
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About this note
By: Brooke Levey
Created: 2010-11-08
File Size: 5 page(s)
Views: 19
Created: 2010-11-08
File Size: 5 page(s)
Views: 19
About StudyBlue
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Things like personalized quizzes and friendly reminders about when (and what) to study next.
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