Chap12(Agg Demand Open Economy)0
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Transcript of Chap12(Agg Demand Open Economy)0
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7/31/2019 Chap12(Agg Demand Open Economy)0
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Aggregate Demand in the Open
Economy: The Mundell-Fleming
model, based on ISLM model
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Learning objectives
The Mundell-Fleming model:IS-LM for the small open economy
Causes and effects of interest rate
differentialsArguments for fixed vs. floating
exchange rates
The aggregate demand curve for thesmall open economy
slide 1
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The Mundell-Fleming Model
Key assumption:Small open economy with perfect capitalmobility.
r = r*
Goods market equilibrium---the IS* curve:
slide 2
( ) ( ) ( )*Y C Y T I r G NX e
wheree = nominal exchange rate
= foreign currency per unit of domestic
currency
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The IS*curve: Goods Market Eqm
The IS*curve is drawn
for a given value ofr*.
Intuition for the slope:
slide 3
Y
e
IS*
( ) ( ) ( )*
Y C Y T I r G NX e
e NX Y
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The LM*curve: Money Market Eqm
The LM*curve
is drawn for a given
value ofr*
is vertical because:
given r*, there is
only one value ofY
that equates money
demand with supply,
regardless ofe.
slide 4
Y
e LM*
( , )*
M P L r Y
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Equilibrium in the Mundell-Fleming model
slide 5
Y
e LM*
( , )*M P L r Y
IS*
( ) ( ) ( )*Y C Y T I r G NX e
equilibrium
exchange
rate
equilibrium
level of
income
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Floating & fixed exchange rates
In a system offloating exchange rates,e is allowed to fluctuate in response tochanging economic conditions.
In contrast, under fixed exchange rates,
the central bank trades domestic for foreigncurrency at a predetermined price.
We now consider fiscal, monetary, and trade
policy: first in a floating exchange ratesystem, then in a fixed exchange rate system.
slide 6
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Fiscal policy under floating exchange rates
At any given value ofe,
a fiscal expansionincreases Y,
shifting IS*to the right.
slide 7
Y
e
( , )*M P L r Y ( ) ( ) ( )
*Y C Y T I r G NX e
Y1
e1
1
*LM
1
*IS
2
*IS
e2
Results:
e> 0, Y= 0
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Lessons about fiscal policy
In a small open economy with perfect capitalmobility, fiscal policy cannot affect real GDP.
Crowding out
closed economy:
Fiscal policy crowds out investment by
causing the interest rate to rise.
small open economy:
Fiscal policy crowds out net exports bycausing the exchange rate to appreciate.
slide 8
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Mon. policy under floating exchange rates
An increase in M shifts
LM* right because Y
must rise to restore eqm
in the money market.
slide 9
Y
e
( , )*M P L r Y ( ) ( ) ( )
*Y C Y T I r G NX e
e1
Y1
1
*LM
1
*IS
Y2
2
*LM
e2
Results:
e< 0, Y > 0
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Lessons about monetary policy
Monetary policy affects output by affectingone (or more) of the components of aggregate
demand:
closed economy: M r I Y
small open economy: M e NX Y
Expansionary mon. policy does not raise world
aggregate demand, it shifts demand from foreign
to domestic products.Thus, the increases in income and employment
at home come at the expense of losses abroad.
slide 10
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Trade policy under floating exchange rates
At any given value ofe,
a tariff or quota reducesimports, increases NX,
and shifts IS* to the right.
slide 11
( , )*M P L r Y ( ) ( ) ( )
*Y C Y T I r G NX e
Y
e
e1
Y1
1
*LM
1
*IS
2
*IS
e2
Results:
e> 0, Y= 0
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Lessons about trade policy
Import restrictions cannot reduce a trade deficit.
Even though NX is unchanged, there is less trade:
the trade restriction reduces imports
the exchange rate appreciation reduces exports
Less trade means fewer gains from trade. Import restrictions on specific products save jobs in
the domestic industries that produce those products,but destroy jobs in export-producing sectors.
Hence, import restrictions fail to increase totalemployment.
Worse yet, import restrictions create sectoralshifts, which cause frictional unemployment.
slide 12
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Fixed exchange rates
Under a system of fixed exchange rates, thecountrys central bank stands ready to buy or sell
the domestic currency for foreign currency at a
predetermined rate.
In the context of the Mundell-Fleming model,the central bank shifts the LM* curve as
required to keep e at its preannounced rate.
This system fixes the nominal exchange rate.
In the long run, when prices are flexible,
the real exchange rate can move
even if the nominal rate is fixed.
slide 13
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Fiscal policy under fixed exchange rates
Under floating rates, afiscal expansion would
raise e.
slide 14
Y
e
Y1
e1
1
*LM
1
*IS
2
*IS
Results:
e= 0, Y > 0 Y2
2
*LM
To keep efrom rising,
the central bank mustsell domestic currency,
which increases M
and shifts LM*right.
Under floating rates,fiscal policy ineffective
at changing output.
Under fixed rates,
fiscal policy is veryeffective at changing
output.
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Mon. policy under fixed exchange rates
An increase in M would shiftLM* right and reduce e.
slide 15
2
*LM
Y
e
Y1
1
*LM
1
*IS
e1
To prevent the fall in e,
the central bank mustbuy domestic currency,
which reduces M and
shifts LM* back left.
Results:
e= 0, Y = 0
Under floating rates,monetary policy is very
effective at changing
output.
Under fixed rates,
monetary policy cannot be
used to affect output.
2
*LM
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Trade policy under fixed exchange rates
A restriction on importsputs upward pressure one.
slide 16
Y
e
Y1
e1
1
*LM
1
*IS
2
*IS
Results:
e= 0, Y > 0 Y2
2
*LM
To keep efrom rising,
the central bank must
sell domestic currency,
which increases M
and shifts LM*right.
Under floating rates,import restrictions do not
affect Y or NX.
Under fixed rates,
import restrictionsincrease Y and NX.
But, these gains come at
the expense of other
countries, as the policymerely shifts demand from
foreign to domestic goods.
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M-F: summary of policy effects
type of exchange rate regime:
floating fixed
impact on:
Policy Y e NX Y e NX
fiscal expansion 0 0 0
mon. expansion 0 0 0
import restriction 0 0 0
slide 17
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CASE STUDY:
The Mexican Peso Crisis
slide 18
10
15
20
25
30
35
7/10/94 8/29/94 10/18/94 12/7/94 1/26/95 3/17/95 5/6/95
U.S.
CentsperMex
icanPeso
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CASE STUDY:
The Mexican Peso Crisis
slide 19
10
15
20
25
30
35
7/10/94 8/29/94 10/18/94 12/7/94 1/26/95 3/17/95 5/6/95
U.S.
CentsperMex
icanPeso
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The Peso Crisis didnt just hurt Mexico
U.S. goods more expensive to Mexicans U.S. firms lost revenue
Hundreds of bankruptcies along
U.S.-Mex border
Mexican assets worth less in dollars
Affected retirement savings of
millions of U.S. citizens
slide 20
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Understanding the crisis
In the early 1990s, Mexico was an attractiveplace for foreign investment.
During 1994, political developments caused anincrease in Mexicos risk premium ( ):
peasant uprising in Chiapas assassination of leading presidential
candidate
Another factor:The Federal Reserve raised U.S. interest ratesseveral times during 1994 to prevent U.S.inflation. (So, r*> 0)
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Understanding the crisis
These events put downward pressure onthe peso.
Mexicos central bank had repeatedlypromised foreign investors that it
would not allow the pesos value to fall,so it bought pesos and sold dollars to
prop up the peso exchange rate.
Doing this requires that Mexicos centralbank have adequate reserves of dollars.Did it?
slide 22
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Dollar reserves ofMexicos central bank
December 1993 $28 billion
August 17, 1994 $17 billion
December 1, 1994 $ 9 billion
December 15, 1994 $ 7 billion
slide 23
During 1994, Mexicos central bank hid the
fact that its reserves were being depleted.
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the disaster
Dec. 20: Mexico devalues the peso by 13%(fixes e at 25 cents instead of 29 cents)
Investors are shocked! ! !
and realize the central bank must be running
out of reserves
, Investors dump their Mexican assets and
pull their capital out of Mexico.
Dec. 22: central banks reserves nearly gone.It abandons the fixed rate and lets e float.
In a week, e falls another 30%.
slide 24
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The rescue package
1995: U.S. & IMF set up $50b line ofcredit to provide loan guarantees toMexicos govt.
This helped restore confidence in Mexico,reduced the risk premium.
After a hard recession in 1995, Mexicobegan a strong recovery from the crisis.
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Floating vs. Fixed Exchange Rates
Argument for floating rates: allows monetary policy to be used to
pursue other goals (stable growth, low
inflation)Arguments for fixed rates:
avoids uncertainty and volatility, making
international transactions easier disciplines monetary policy to prevent
excessive money growth & hyperinflation
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Mundell-Fleming and the ADcurve
So far in M-F model,
Phas been fixed.
Next: to derive theADcurve, consider theimpact of a change in P in the M-F model.
We now write the M-F equations as:
slide 28
(Earlier in this chapter, Pwas fixed, so we
could writeNXas a function ofeinstead of .)
( ) ( , )*M P L r Y LM*
( ) ( ) ( ) ( )*Y C Y T I r G NX IS*
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Deriving the ADcurve
slide 29
Y1Y2 Y
Y
P
IS*
LM*(P1)LM*(P
2)
AD
P1
P2
Y2 Y1
2
1
WhyADcurve has
negative slope:
P
LM shifts left
NX
Y
(M/P)
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From the short run to the long run
slide 30
LM*(P1)
1
2
then there is
downward pressure on
prices.
Over time, P willmove down, causing
(M/P)
NX
Y
P1 SRAS1
1Y
1Y Y
Y
P
IS*
AD
Y
Y
LRAS
LM*(P2)
P2 SRAS2
1
If ,Y Y
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Large: between small and closed
Many countries - including the U.S. - are neither
closed nor small open economies.
A large open economy is in between the
polar cases of closed & small open.
Consider a monetary expansion:
Like in a closed economy,
M > 0 r I (though not as much)
Like in a small open economy,M > 0 NX (though not as much)
slide 31
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Chapter summary
1. Mundell-Fleming model
the IS-LM model for a small open economy.
takes Pas given
can show how policies and shocks affect
income and the exchange rate2. Fiscal policy
affects income under fixed exchange rates, butnot under floating exchange rates.
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Chapter summary
3. Monetary policy
affects income under floating exchange rates.
Under fixed exchange rates, monetary policy isnot available to affect output.
4. Interest rate differentials exist if investors require a risk premium to hold
a countrys assets.
An increase in this risk premium raises
domestic interest rates and causes thecountrys exchange rate to depreciate.
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Chapter summary
5. Fixed vs. floating exchange rates
Under floating rates, monetary policy isavailable for can purposes other thanmaintaining exchange rate stability.
Fixed exchange rates reduce some of theuncertainty in international transactions.
lid 34