thorvaldur gylfason joint vienna institute course on macroeconomic policies in times of high capital...
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Thorvaldur GylfasonJoint Vienna Institute Course on
Macroeconomic Policies in Times of High Capital Mobility
Vienna, AustriaMay 16–20, 2011
1. Real exchange rates versus nominal exchange rates
2. Exchange rate policy, overvaluation, and welfare
3. Exchange rate regimes To float or not to floatTo float or not to float
4. How many monies do we need?
11
*P
ePQ
Q = real exchange ratee = nominal exchange rateP = price level at homeP* = price level abroad
Increase in Q means real appreciation
ee refers to
foreign currency
content of
domestic currency
Q = real exchange ratee = nominal exchange rateP = price level at homeP* = price level abroad
Devaluation or
depreciation of e
makes Q also
depreciate
unless P rises so
as to leave Q
unchanged
*P
ePQ
*P
ePQ
1.1. Suppose ee falls fallsThen more rubles per dollar, so XX rises rises, ZZ falls falls
2.2. Suppose PP falls fallsThen XX rises rises, ZZ falls falls
3.3. Suppose P*P* rises risesThen XX rises rises, ZZ falls falls
Capture all three by supposing QQ fallsfalls
Then XX rises rises, ZZ falls falls
Remember:
Devaluation needs to be accompanied by fiscal and fiscal and monetary restraint monetary restraint to prevent prices from rising and thus eating up the benefits of devaluation
To work, nominal devaluation must result in realreal devaluation
*P
ePQ
Foreign exchangeForeign exchange
Real exch
an
ge r
ate
Real exch
an
ge r
ate
ImportsImports
ExportsExports
22
Earnings from
exports of goods,
services, and capital
Payments for
imports of goods,
services, and capital
Equilibrium
Equilibrium between demand and supply in foreign exchange market establishesEquilibrium real exchange rateEquilibrium in balance of
paymentsBOP = X + FBOP = X + Fxx – Z – F – Z – Fz z
= X – Z + F= X – Z + F = current account + capital
account = 0 X – Z = current account
F = capital and financial account
Foreign exchangeForeign exchange
Real exch
an
ge r
ate
Real exch
an
ge r
ate
ImportsImports
ExportsExports
Overvaluation
Deficit
RR R moves when e is fixed
Foreign exchangeForeign exchange
Pri
ce o
f fo
reig
n e
xch
ang
ePri
ce o
f fo
reig
n e
xch
ang
e
Supply (exports)Supply (exports)
Demand (imports)Demand (imports)
Overvaluation
Deficit
Overvaluation works like a price ceiling
Appreciation of currency in real terms, either through inflation or nominal appreciation, leads to a loss of export competitiveness
In 1960s, Netherlands discovered natural resources (gas deposits)Currency appreciated Exports of manufactures and services
suffered, but not for long Not unlike natural resource discoveries,
aid inflows could trigger the Dutch disease in receiving countriesSee my “Dutch Disease” in New
Palgrave Dictionary of Economics
Online
Foreign exchange
Real exch
an
ge r
ate
Imports
Exports without oil
Exports with oil
A
C BOil discovery
leads to appreciation
, and reduces nonoil exports
Compositi
on of exports
matters
Foreign exchange
Real exch
an
ge r
ate
Imports
Exports without aidaid
Exports with aidaid
A
C B
Foreign aid
leads to appreciation
, and reduces exports (e.g., Zambia)
Trade vs.
aid
Governments may try to keep the national currency overvaluedTo keep foreign exchange cheapTo have power to ration scarce
foreign exchangeTo make GNP look larger than it
is
Other examples of price ceilingsNegative real interest ratesRent controls in cities
Inflation can result in an overvaluation of the national currencyRemember: Q = eP/P*Q = eP/P*
Suppose ee adjusts to PP with a lag
Then QQ is directly proportional to inflation
Numerical example
Time
100
120
Real exchange rate
110 Average
Hence, increased
inflation lifts the
realreal exchange rate
as long as the
nominal exchange
rate adjusts with a
lag
Suppose inflation rises to 20 percent per year
Under floatingfloatingDepreciation is automatic: ee
movesBut depreciation may take time
Under a fixed exchange rate fixed exchange rate regimeregimeDevaluation will lower e and
thereby also QQ – provided inflation is kept under control
Does devaluation improve the current account?The Marshall-Lerner condition
B = eeX – Z = eX(e) – Z(e)Not clear that a lower ee helps BB
because decrease in ee lowerslowers eXeX if XX stays put
Let’s do the arithmeticBottom line is:Devaluation strengthens current
account as long as1ba
Suppose prices are
fixed, so that e = Q
aa = elasticity of exports
bb = elasticity of imports
ValuatioValuation effect n effect arises arises from the from the ability ability to affect to affect foreign foreign pricesprices
Lower ee raises XX
Lower ee reduces
ZZ
ZeXB )()( eZeeXB
de
dZ
de
dXeX
de
dB
e
Z
Z
e
de
dZ
e
X
X
e
de
dXeX
de
dB
1 1
- +
Export elasticityExport elasticityImportImport
elasticityelasticity-a b
Lower ee raises XX
Lower ee reduces
ZZ
e
Z
Z
e
de
dZ
e
X
X
e
de
dXeX
de
dB
XbabXaXXde
dB 1
0de
dB 1baif
XX
Assume X = Z/e initially
Appreciation weakens current
account
-a b
Econometric studies indicate that the Marshall-Lerner condition is almost invariably satisfied
Industrial countries: a = 1, b = 1
Developing countries: a = 1, b = 1.5
Hence, 1ba Devaluation
strengthens the
current account
Elasticity ofElasticity of Elasticity ofElasticity ofexportsexports importsimports
Argentina 0.6 0.9Brazil 0.4 1.7India 0.5 2.2Kenya 1.0 0.8Korea 2.5 0.8Morocco 0.7 1.0Pakistan 1.8 0.8Philippines 0.9 2.7Turkey 1.4 2.7Average 1.1 1.5
Small countries are price takers price takers abroadDevaluation has no effect on the
foreign currency price of exports and imports
So, the valuation effect does notnot arise
Devaluation will, at worst, if exports and imports are insensitive to exchange rates (a = b = 0), leave the current account unchanged
Hence, if a > 0 or b > 0, devaluation strengthens the current account
For an emerging country with … Initial trade balance Initial trade balance Export-to-GDP ratio of 40%Export-to-GDP ratio of 40%
… nominal depreciation by 10% permanently improves trade balance by 1½% to 2% of GDP in medium term
Effect depends on class of Effect depends on class of exporterexporter
Oil, non-oil, manufacturesMost of the effect is through Most of the effect is through imports and is felt within 3 to 5 imports and is felt within 3 to 5 yearsyears
The real exchange rate always always floatsfloatsThrough nominal exchange rate
adjustment or price change
Even so, it matters how countries set their nominal exchange rates because floating takes time
There is a wide spectrum of options, from absolutely fixed to completely flexible exchange rates
33
There is a range of optionsMonetary union or dollarization
Means giving up your national currency or sharing it with others (e.g., EMU, CFA, EAC)
Currency boardLegal commitment to exchange
domestic for foreign currency at a fixed rate
Fixed exchange rate (peg)Crawling pegManaged floatingPure floating
Currency union or dollarization Currency board
Peg FixedFixed Horizontal bandsHorizontal bands
Crawling peg Without bandsWithout bands With bandsWith bands
Floating ManagedManaged
IndependentIndependent
FIXEDFIXED
FLEXIBLFLEXIBLEE
DollarizationUse another country’s currency as sole legal tender
Currency unionShare same currency with other union members
Currency boardLegally commit to exchange domestic
currency for specified foreign currency at fixed rate
Conventional (fixed) pegSingle currency pegCurrency basket peg
Flexible pegFixed but readily adjusted
Crawling pegComplete
Compensate for past inflation
Allow for future inflation
PartialAimed at reducing inflation, but real appreciation results because of the lagged adjustment
Fixed but adjustable
Managed floatingManagement by sterilized intervention
I.e., by buying and selling foreign exchange
Management by interest rate policy, i.e., monetary policy E.g., by using high interest rates to
attract capital inflows and thus lift the exchange rate of the currency
Pure floating
FREE CAPITAL MOVEMENTS
FIXEDEXCHANGE
RATE
MONETARYINDEPENDENCE
MonetaryMonetaryUnion (EU)Union (EU)
Free to choose
only two of three
options; must
sacrifice one of the
three
FREE CAPITAL MOVEMENTS
FIXEDEXCHANGE
RATE
MONETARYINDEPENDENCECapital controls Capital controls
(China)(China)
Free to choose
only two of three
options; must
sacrifice one of the
three
FREE CAPITAL MOVEMENTS
FIXEDEXCHANGE
RATE
MONETARYINDEPENDENCE
Flexible Flexible exchange exchange rate (US, UK, Japan)rate (US, UK, Japan)
Free to choose
only two of three
options; must
sacrifice one of the
three
FREE CAPITAL MOVEMENTS
FIXEDEXCHANGE
RATE
MONETARYINDEPENDENCE
MonetaryMonetaryUnion (EU)Union (EU)
Flexible Flexible exchange exchange rate (US, UK, Japan)rate (US, UK, Japan)
Capital controls Capital controls (China)(China)
Free to choose
only two of three
options; must
sacrifice one of the
three
If capital controls are ruled out in view of the proven benefits of free trade free trade in goods, services, labor, and also capital (four freedomsfour freedoms), …
… then long-run choice boils down to one between monetary independencemonetary independence (i.e., flexible exchange rates) vs. fixed ratesflexible exchange rates) vs. fixed rates Cannot have both!Cannot have both!
Either type of regime has advantages as well as disadvantages
Let’s quickly review main benefits and costs
BenefitsBenefits CostsCosts
Fixed Fixed exchange exchange ratesrates
Floating Floating exchange exchange ratesrates
BenefitsBenefits CostsCosts
Fixed Fixed exchange exchange ratesrates
Stability of Stability of trade and trade and investmentinvestment
Low inflationLow inflation
Floating Floating exchange exchange ratesrates
BenefitsBenefits CostsCosts
Fixed Fixed exchange exchange ratesrates
Stability of Stability of trade and trade and investmentinvestment
Low inflationLow inflation
InefficiencyInefficiency
BOP deficitsBOP deficits
Sacrifice of Sacrifice of monetary monetary independenceindependence
Floating Floating exchange exchange ratesrates
BenefitsBenefits CostsCosts
Fixed Fixed exchange exchange ratesrates
Stability of Stability of trade and trade and investmentinvestment
Low inflationLow inflation
InefficiencyInefficiency
BOP deficitsBOP deficits
Sacrifice of Sacrifice of monetary monetary independenceindependence
Floating Floating exchange exchange ratesrates
EfficiencyEfficiency
BOP BOP equilibriumequilibrium
BenefitsBenefits CostsCosts
Fixed Fixed exchange exchange ratesrates
Stability of Stability of trade and trade and investmentinvestment
Low inflationLow inflation
InefficiencyInefficiency
BOP deficitsBOP deficits
Sacrifice of Sacrifice of monetary monetary independenceindependence
Floating Floating exchange exchange ratesrates
EfficiencyEfficiency
BOP BOP equilibriumequilibrium
Instability of Instability of trade and trade and investmentinvestment
InflationInflation
In view of benefits and costs, no single exchange rate regime is right for all countries at all times
The regime of choice depends on time and circumstance If inefficiencyinefficiency and slow growth due to
currency overvaluation are the main problem, floating rates can help
If high inflationinflation is the main problem, fixed exchange rates can help, at the risk of renewed overvaluation
Ones both problems are under control, time may be ripe for monetary union
What do countries do?
To eliminate high
inflation, need fixed
exchange rate for a
time
46Source: Annual Report on Exchange Arrangements and Exchange Restrictions database.
What countries actually do (Number of countries, April What countries actually do (Number of countries, April 2008) 2008)
(3)
(12)
(22)
(5) (2)(66)
(44) (40)
(76)
(84)
(10)
No national currency 6%Currency board 7%Conventional fixed rates
36%Intermediate pegs 5%Managed floating 24%Pure floating 22% 100%
46%
54%
There is a gradual tendency towards floating, from 10% of LDCs in 1975 to almost 50% today, followed by increased interest in fixed ratesincreased interest in fixed rates through economic and monetary unions
In view of the success of the EU and the euro, economic and monetary unions appeal to many other countries with increasing force
Consider four categoriesExisting monetary unionsDe facto monetary unionsPlanned monetary unions Previous – failed! – monetary unions
44
CFA franc14 African countries
CFP franc3 Pacific island states
East Caribbean dollar8 Caribbean island states
Picture of Sir W. Arthur Lewis, the great Nobel-prize winning development economist, adorns the $100 note
Euro, more recent16 EU countries plus 6 or 7 others
Thus far, clearly, a major success in view of old conflicts among European nation states, cultural variety, many different languages, etc.
Australian dollar Australia plus 3 Pacific island states
Indian rupee India plus Bhutan (plus Nepal)
New Zealand dollar New Zealand plus 4 Pacific island states
South African rand South Africa plus Lesotho, Namibia, Swaziland –
and now Zimbabwe Swiss franc
Switzerland plus Liechtenstein US dollar
US plus Ecuador, El Salvador, Panama, and 6 others
East African shilling (2009) Burundi, Kenya, Rwanda, Tanzania, and
Uganda Eco (2009)
Gambia, Ghana, Guinea, Nigeria, and Sierra Leone (plus, perhaps, Liberia)
Khaleeji (2010) Bahrain, Kuwait, Qatar, Saudi-Arabia, and
United Arab Emirates Other, more distant plans
Caribbean, Southern Africa, South Asia, South America, Eastern and Southern Africa, Africa
Danish krone 1886-1939 Denmark and Iceland 1886-1939: 1 IKR = 1 DKR 2009: 2,500 IKR = 1 DKR (due to inflation in
Iceland) Scandinavian monetary union 1873-1914
Denmark, Norway, and Sweden East African shilling 1921-69
Kenya, Tanzania, Uganda, and 3 others Mauritius rupee
Mauritius and Seychelles 1870-1914 Southern African rand
South Africa and Botswana 1966-76 Many others
No significant
divergence of
prices or currency
rates following
separation
99.95%
CentripetalCentripetal tendency to joinjoin monetary unions, thus reducing number of currencies To benefit from stable exchange rates stable exchange rates at the
expense of monetary independence CentrifugalCentrifugal tendency to leaveleave monetary
unions, thus increasing number of currencies To benefit from monetary independence monetary independence often,
but not always, at the expense of exchange rate stability
With globalization, centripetal tendencies appear stronger than centrifugal onesThe EndThe End