Exchange Rates: Appreciation, Depreciation, Causes, Effects and Singapore Examples — Complete A-Level Economics Guide
Exchange Rates: Appreciation, Depreciation, Causes, Effects and Singapore Examples — Complete A-Level Economics Guide
An exchange rate is the price of one currency expressed in terms of another currency.
For A-Level Economics, students should understand not only whether a currency appreciates or depreciates, but also the full transmission mechanism:
Exchange rate change → export/import prices change → demand for exports/imports changes → net exports change → aggregate demand changes → growth, unemployment, inflation and current account are affected.
The final impact depends on important conditions such as:
- price elasticity of demand for exports and imports;
- time period;
- state of the economy;
- imported-input dependence;
- business confidence;
- global economic conditions.
What Is an Exchange Rate?
Suppose:
S$1 = US$0.75
This means one Singapore dollar can be exchanged for 0.75 US dollars.
Alternatively:
US$1 = S$1.33
Both describe the exchange relationship between the two currencies.
Appreciation
A currency appreciates when its value rises relative to another currency.
Example:
Initially:
S$1 = US$0.75.
Later:
S$1 = US$0.80.
The Singapore dollar has appreciated against the US dollar because one Singapore dollar now buys more US dollars.
Depreciation
A currency depreciates when its value falls relative to another currency.
Example:
Initially:
S$1 = US$0.75.
Later:
S$1 = US$0.70.
The Singapore dollar has depreciated because one Singapore dollar buys fewer US dollars.
Appreciation vs Revaluation
These terms are related but not identical.
Appreciation
Usually refers to a rise in currency value caused by market forces under a floating or managed exchange-rate system.
Revaluation
Usually refers to an official upward adjustment in the currency’s value under a fixed or tightly managed exchange-rate arrangement.
Depreciation vs Devaluation
Depreciation
Currency falls because of market forces.
Devaluation
Government or monetary authority officially lowers the currency’s value within a fixed exchange-rate system.
Students should use the correct terminology.
How Are Exchange Rates Determined?
In a floating foreign-exchange market:
Exchange rates are influenced by:
Demand and supply for currencies.
People demand a currency when they need it to purchase:
- exports from that country;
- financial assets;
- property;
- investments.
People supply a currency when they exchange it for another currency to purchase foreign goods, services or assets.
Demand for Singapore Dollars
Foreigners may demand Singapore dollars because they want to:
- buy Singapore exports;
- visit Singapore;
- invest in Singapore businesses;
- purchase Singapore financial assets.
Therefore:
Demand for SGD ↑
→ upward pressure on SGD value.
Supply of Singapore Dollars
Singapore residents may supply SGD when they:
- buy imports;
- travel overseas;
- invest in foreign assets.
Therefore:
Supply of SGD ↑
→ downward pressure on SGD value.
What Causes Currency Appreciation?
A currency may appreciate because of:
- stronger foreign demand for exports;
- increased foreign investment;
- higher demand for domestic financial assets;
- expectations of future appreciation;
- relatively favourable economic conditions;
- monetary or exchange-rate policy.
1. Increased Export Demand
Suppose overseas consumers buy more Singapore goods and services.
They need Singapore dollars to make payments.
Therefore:
Demand for SGD ↑
→ SGD appreciates, other things equal.
2. Increased Foreign Investment
Suppose overseas firms increase investment in Singapore.
They may need SGD to:
- build operations;
- pay workers;
- purchase assets.
Demand for SGD ↑.
Therefore:
SGD may appreciate.
3. Higher Returns on Financial Assets
In a conventional floating-rate economy:
Higher domestic interest rates can make domestic financial assets more attractive.
Capital inflows ↑
→ demand for currency ↑
→ currency appreciates.
However:
This mechanism should be applied carefully in Singapore because monetary policy is centred on the exchange rate itself rather than a conventional domestic policy interest-rate target.
4. Expectations
Suppose investors expect a currency to appreciate.
They may purchase it now.
Demand ↑.
This can itself place upward pressure on the currency.
Therefore:
Expectations can influence current exchange rates.
What Causes Depreciation?
The reverse factors can cause depreciation.
For example:
Export demand ↓
foreign investment ↓
capital outflows ↑
expectations weaken
→ demand for domestic currency ↓ and/or supply ↑
→ currency depreciates.
Effect of Appreciation on Exports
Suppose the Singapore dollar appreciates.
Singapore-produced goods become more expensive in foreign currency terms, assuming firms keep their SGD prices unchanged.
Therefore:
Foreign consumers may buy fewer Singapore exports.
Hence:
Demand for exports ↓.
Example
Singapore exporter charges:
S$100.
Initially:
S$1 = US$0.75.
US consumer pays:
US$75.
After appreciation:
S$1 = US$0.80.
The same product costs:
US$80.
Therefore:
Singapore export becomes more expensive to the US buyer.
Export Competitiveness
Currency appreciation can reduce price competitiveness.
Foreign consumers may switch towards substitutes produced in other countries.
Therefore:
X ↓.
However:
The magnitude depends on PED for exports.
Effect of Appreciation on Imports
Appreciation makes foreign goods cheaper in domestic-currency terms.
Example:
US product costs:
US$100.
Initially:
US$1 = S$1.33.
Singapore buyer pays about:
S$133.
After SGD appreciation:
US$1 = S$1.25.
Singapore buyer pays:
S$125.
Therefore:
Imports become cheaper.
Import Demand
Import prices ↓
→ quantity demanded of imports may ↑.
Therefore:
M may rise.
Appreciation and Net Exports
Since:
X may ↓
M may ↑,
net exports:
X − M
may fall.
Therefore:
AD may decrease.
Appreciation and Aggregate Demand
AD = C + I + G + (X − M).
If:
X ↓
M ↑,
then:
(X − M) ↓
→ AD ↓.
Therefore:
Real GDP may fall.
Appreciation and Economic Growth
AD ↓
→ firms experience weaker demand
→ output growth may slow.
Therefore:
Actual economic growth ↓.
However:
The effect may be limited if domestic consumption or investment remains strong.
Appreciation and Unemployment
If exporters face weaker demand:
Production ↓
→ derived demand for labour ↓.
Therefore:
Unemployment may rise, particularly in export-oriented industries.
Appreciation and Inflation
This is particularly important for Singapore.
Appreciation can reduce inflation through several channels.
Channel 1: Cheaper Imported Consumer Goods
SGD appreciates.
Imported products become cheaper in SGD terms.
Therefore:
Consumer prices ↓ relative to otherwise.
Imported inflationary pressure falls.
Channel 2: Cheaper Imported Inputs
Firms may import:
- energy;
- food inputs;
- raw materials;
- machinery;
- intermediate goods.
Appreciation:
Input cost in SGD ↓.
Therefore:
Production costs ↓
→ cost-push inflationary pressure ↓.
Channel 3: Lower Aggregate Demand
Appreciation:
X ↓
M ↑
→ AD ↓.
If the economy had excess demand:
Demand-pull inflation ↓.
Therefore:
Currency appreciation can reduce both:
imported inflation
and potentially:
demand-pull inflation.
Singapore and Imported Inflation
Singapore imports a significant range of consumer products and productive inputs.
Therefore:
Exchange-rate movements can have an important effect on domestic prices.
A stronger Singapore dollar can cushion increases in foreign-currency prices.
Imported Inflation Example
Suppose world oil price rises:
US$80 → US$100.
This would normally increase Singapore’s import costs.
But if SGD appreciates against USD at the same time:
The increase in SGD-denominated oil cost is smaller.
Therefore:
Appreciation can partially offset imported inflation.
Appreciation and Purchasing Power
A stronger currency increases domestic residents’ purchasing power over foreign goods and services.
Therefore:
Overseas travel and imported goods become cheaper.
This may improve material standard of living for consumers.
But Producers May Lose
Export-oriented firms may experience:
Revenue ↓
profit ↓.
Therefore:
Appreciation creates winners and losers.
Consumers may benefit from cheaper imports while exporters face weaker competitiveness.
Effect of Depreciation on Exports
If SGD depreciates:
Singapore exports become cheaper in foreign currency terms.
Therefore:
Foreign demand may rise.
X ↑.
Effect of Depreciation on Imports
Imported goods become more expensive in SGD.
Therefore:
Quantity demanded of imports may fall.
M ↓.
Depreciation and Net Exports
X ↑
M ↓.
Therefore:
Net exports may improve.
AD ↑.
Depreciation and Economic Growth
AD ↑
→ firms’ sales ↑
→ production ↑
→ actual economic growth ↑.
Depreciation and Employment
Production ↑
→ derived demand for labour ↑
→ unemployment ↓.
Therefore:
A weaker currency can stimulate export-oriented sectors.
Depreciation and Inflation
However:
Imports become more expensive.
Therefore:
Imported inflation ↑.
Imported inputs also cost more.
Firm costs ↑.
Hence:
Cost-push inflationary pressure ↑.
Depreciation and AD Inflation
Depreciation can also:
X ↑
M ↓
→ AD ↑.
If economy is close to full employment:
Demand-pull inflation ↑.
Therefore:
Depreciation can generate inflation through:
cost-side and demand-side channels.
Stronger Currency: Summary
Appreciation tends to:
Exports less competitive
Imports cheaper
Net exports ↓
AD ↓
Growth ↓
Unemployment ↑
but:
Imported inflation ↓.
Weaker Currency: Summary
Depreciation tends to:
Exports more competitive
Imports more expensive
Net exports ↑
AD ↑
Growth ↑
Unemployment ↓
but:
Inflation ↑.
These are tendencies, not guaranteed outcomes.
Price Elasticity Is Crucial
The exchange-rate effect on trade depends on:
PED for exports and imports.
Suppose currency depreciates.
Export price falls to foreign buyers.
But if demand for exports is highly price inelastic:
Quantity demanded rises little.
Therefore:
Export revenue may not rise significantly.
Marshall-Lerner Condition
A depreciation is more likely to improve the trade balance if the combined price elasticities of demand for exports and imports are sufficiently large.
A common formulation is:
|PEDx| + |PEDm| > 1
This is known as the:
Marshall-Lerner Condition.
Why Does It Matter?
Following depreciation:
Exports become cheaper to foreigners.
Imports become more expensive domestically.
Whether the value of:
exports rises enough
and
imports falls enough
depends on quantity responsiveness.
If Demand Is Inelastic
Suppose import demand is highly inelastic.
Depreciation makes imports more expensive.
But consumers continue buying almost the same quantity.
Therefore:
Total import expenditure may actually rise.
This could worsen the trade balance initially.
J-Curve Effect
After depreciation:
The trade balance may initially worsen before improving.
This is called the:
J-Curve effect.
Why Does the J-Curve Occur?
In the short run:
Consumers and firms may be locked into:
- contracts;
- habits;
- supplier relationships.
Therefore:
Quantities respond slowly.
But prices change immediately.
Hence:
Import expenditure may rise before import volumes fall.
Over Time
Consumers find substitutes.
Firms change suppliers.
Exporters gain new customers.
Therefore:
PED becomes more elastic.
Net exports may improve.
This produces the J-shaped pattern.
Short Run vs Long Run
This is one of the strongest exchange-rate evaluation points.
Short run
Demand may be relatively price inelastic.
Long run
Consumers have more time to substitute.
Therefore:
Exchange-rate policy may become more effective over time.
Depreciation Does Not Guarantee Export Growth
Foreign demand also depends on:
- global income;
- product quality;
- reliability;
- branding;
- supply capacity.
Suppose global economy is in severe recession.
Even if exports become 10% cheaper:
Foreign buyers may still cut expenditure.
Therefore:
X may not increase substantially.
Non-Price Competitiveness
Competitiveness does not depend only on exchange rates.
It also depends on:
- product quality;
- innovation;
- brand reputation;
- reliability;
- productivity.
Therefore:
A country with strong non-price competitiveness may tolerate a stronger currency more easily.
Singapore Example: High Value-Added Exports
Suppose buyers choose Singapore-produced services because of:
- quality;
- trust;
- specialised expertise.
Demand may be relatively less price sensitive.
Therefore:
A modest appreciation may have a relatively small effect on export quantity.
Imported Inputs Complicate the Depreciation Story
Suppose Singapore exporters import a large proportion of their raw materials.
SGD depreciates.
Foreign customers pay less for exports.
But:
Imported input costs ↑.
Therefore:
Firms’ production costs ↑.
This partially offsets the competitiveness gain.
Example
Exporter sells electronics.
SGD depreciates.
Export price competitiveness improves.
But semiconductor components are imported.
Component cost ↑.
Therefore:
Profit margin may be squeezed.
Hence:
Depreciation does not automatically make every exporter more competitive.
Appreciation Can Help Exporters Too
This sounds counterintuitive.
If exporters depend heavily on imported inputs:
SGD appreciation ↓ input cost.
Therefore:
Production cost ↓.
This may partly offset the negative effect of higher foreign-currency export prices.
Exchange Rate and Current Account
The current account includes trade in:
- goods;
- services;
along with income flows and transfers.
A depreciation can potentially improve the trade balance and therefore current account.
But:
The outcome depends on:
- elasticities;
- imported inputs;
- global demand;
- time period.
Exchange Rates and Tourism
Appreciation:
Singapore becomes more expensive for foreign tourists.
Inbound tourism demand may ↓.
At the same time:
Foreign travel becomes cheaper for Singapore residents.
Outbound tourism spending may ↑.
Therefore:
Net travel-service exports could weaken.
Depreciation and Tourism
Singapore becomes cheaper for foreign visitors.
Inbound tourism may ↑.
Overseas holidays become more expensive for residents.
Outbound tourism may ↓.
Therefore:
Net tourism receipts may improve.
Again:
PED matters.
Exchange Rates and Foreign Investment
Exchange-rate movements can affect foreign direct investment.
A weaker currency may make domestic assets cheaper to foreign investors.
However:
Investors also consider:
- future exchange rates;
- economic growth;
- political stability;
- infrastructure;
- taxes;
- labour skills.
Therefore:
Exchange rate is only one determinant.
Exchange-Rate Expectations
Suppose foreign investor expects SGD depreciation.
Even if Singapore assets offer attractive returns:
Investor may worry that currency losses will reduce the return when converted back.
Therefore:
Expected depreciation can discourage capital inflows.
Exchange Rate and Interest Rates
In many economies:
Interest-rate differences influence capital flows.
Higher interest rates can:
Foreign capital inflows ↑
→ currency demand ↑
→ appreciation pressure.
Lower rates can create the opposite pressure.
But exchange rates are influenced by expectations and many other variables.
Singapore’s Exchange-Rate-Centred Monetary Policy
Singapore is unusual because monetary policy is conducted primarily through the exchange rate rather than a conventional interest-rate target.
The Monetary Authority of Singapore manages the Singapore dollar against a trade-weighted basket of currencies within a policy band.
For A-Level Economics:
Students should understand the economic logic:
Stronger exchange-rate path
can reduce imported inflation.
Weaker exchange-rate path
can provide more support to external competitiveness and growth.
Why Singapore Uses the Exchange Rate
Singapore is highly open to international trade.
Imports make up an important part of:
- consumption;
- production costs.
Therefore:
Exchange-rate movements have a significant influence on domestic prices.
This makes the exchange rate a powerful monetary-policy transmission channel.
Trade-Weighted Exchange Rate
Singapore does not focus on SGD against only one currency.
Instead:
The exchange rate is considered against a basket of currencies representing important trading partners.
This is more relevant because Singapore trades with many economies.
Why a Basket?
Suppose SGD strengthens against USD but weakens against several other trading-partner currencies.
Looking only at SGD/USD could give a misleading picture.
Therefore:
A trade-weighted measure better captures Singapore’s overall exchange-rate position.
Appreciation to Control Inflation
Suppose Singapore faces imported inflation.
A stronger SGD:
Imported consumer prices ↓
imported input cost ↓
→ domestic inflationary pressure ↓.
Therefore:
Exchange-rate appreciation can help maintain price stability.
But There Is a Trade-Off
Stronger SGD:
Imported inflation ↓.
But:
Export competitiveness may ↓
AD may ↓
growth may slow.
Therefore:
Monetary authorities face a trade-off between:
price stability
and
external competitiveness / growth.
Appreciation During Strong Growth
Suppose global demand is strong.
Singapore exports are booming.
At the same time:
Inflationary pressure is increasing.
A stronger exchange rate may be more suitable because:
Strong external demand can offset some negative export-price effects.
Meanwhile:
Imported inflation is reduced.
Appreciation During Recession
Suppose global demand collapses.
Exports already weak.
Further appreciation could:
Export competitiveness ↓ further
→ AD ↓ further.
Therefore:
The economic situation matters.
Exchange Rate and Cost-Push Inflation
Suppose global commodity prices rise.
This is an external supply shock.
If currency appreciates:
Domestic-currency cost of commodities rises less.
Therefore:
The SRAS reduction may be smaller.
Hence:
Appreciation can cushion imported cost-push inflation.
Exchange Rate and AD-AS
Consider appreciation.
Net exports ↓.
AD shifts left.
At the same time:
Imported inputs become cheaper.
Production costs may fall.
SRAS may shift right.
Therefore:
The overall effect can involve both AD and AS.
This is a higher-level point.
Appreciation: Dual Effect
Demand side
X − M ↓
→ AD ↓.
Supply side
Imported input cost ↓
→ SRAS ↑.
Both effects tend to reduce the price level.
But the output effect becomes ambiguous because:
AD effect reduces output,
while:
AS effect increases output.
Depreciation: Dual Effect
Demand side
X − M ↑
→ AD ↑.
Supply side
Imported costs ↑
→ SRAS ↓.
Both effects tend to increase the price level.
But the effect on real output is ambiguous.
AD increases output.
SRAS reduction decreases output.
Therefore:
You should not always state that depreciation definitely raises real GDP.
This Is Excellent A-Level Evaluation
A weaker currency can stimulate net exports.
But if the economy is heavily dependent on imported inputs:
SRAS may decrease substantially.
Therefore:
Growth benefit may be smaller than expected while inflation rises significantly.
Exchange Rate and Standard of Living
Appreciation can improve consumer purchasing power.
Imported goods ↓ in price.
Foreign travel ↓ in cost.
Therefore:
Material standard of living may improve.
But:
Export-sector unemployment could worsen.
Hence:
Overall welfare effect is uncertain.
Depreciation and Standard of Living
Depreciation can support:
Exports
employment.
But:
Imported goods become more expensive.
Real purchasing power ↓.
Therefore:
Households may face lower material living standards.
Distributional Effects
Exchange-rate changes create different winners and losers.
Appreciation benefits
- importers;
- consumers of imported goods;
- overseas travellers;
- firms using imported inputs.
Appreciation may hurt
- exporters;
- tourism businesses serving foreigners;
- domestic firms competing with cheaper imports.
Depreciation Winners
Potential beneficiaries:
- exporters;
- domestic tourism;
- firms competing against imports.
Potential losers:
- importers;
- consumers;
- firms reliant on imported inputs.
Exchange Rate and Structural Change
Persistent currency movements may alter resource allocation.
If currency remains strong:
Export sectors facing intense price competition may shrink.
Resources may move into:
- higher value-added services;
- less price-sensitive industries.
Therefore:
Exchange rates can contribute to structural adjustment.
But Currency Depreciation Can Delay Restructuring
Suppose inefficient firms remain competitive only because currency is weak.
A depreciation may reduce pressure to:
- raise productivity;
- innovate.
Therefore:
Relying repeatedly on depreciation can weaken incentives for long-run supply-side improvement.
This is a useful evaluation point.
Exchange Rate vs Supply-Side Policy
To improve competitiveness:
Government could rely on a weaker currency.
Or:
Improve productivity.
Depreciation
Can improve price competitiveness relatively quickly.
Supply-side policy
Improves fundamental productivity and non-price competitiveness but takes longer.
Long-run competitiveness is generally stronger when based on productivity rather than repeated currency weakness.
Exchange Rate and Inflation Expectations
If repeated depreciation causes persistent imported inflation:
Workers may demand higher wages.
Wages ↑
→ production costs ↑.
This could reinforce inflationary pressure.
Therefore:
Expectations matter.
Exchange Rate Pass-Through
Exchange-rate pass-through refers to how much a currency movement changes domestic import and consumer prices.
Pass-through may be incomplete.
Why?
Foreign exporters may change profit margins rather than fully adjusting prices.
Retailers may absorb part of the change.
Therefore:
A 10% appreciation does not necessarily cause imported retail prices to fall exactly 10%.
Why Pass-Through Matters
If exchange-rate pass-through is weak:
Appreciation may have a smaller effect on inflation.
If pass-through is strong:
Exchange-rate policy can affect domestic prices more powerfully.
Time Lags in Pass-Through
Prices may not change immediately because firms have:
- contracts;
- inventories;
- hedging arrangements.
Therefore:
Exchange-rate changes may affect inflation with a lag.
Exchange-Rate Hedging
Firms can use financial contracts to reduce exposure to currency movements.
Therefore:
Short-run profit effects may be smaller.
But when hedges expire:
The exchange-rate impact may become more visible.
Fixed Exchange Rate
Under a fixed exchange-rate system:
Government or central bank commits to maintain currency around a specified value.
Advantages can include:
- greater exchange-rate certainty;
- lower transaction risk.
But:
Maintaining the rate can restrict monetary-policy independence.
Floating Exchange Rate
Under a floating system:
Market forces largely determine the exchange rate.
Advantages:
Exchange rate can adjust to external shocks.
But:
Greater volatility may create uncertainty for firms.
Managed Exchange Rate
A managed system combines market forces with intervention or policy guidance.
Authorities influence the exchange rate without fixing it permanently at one exact value.
Singapore’s framework is a distinctive managed arrangement.
Exchange-Rate Volatility
Large exchange-rate fluctuations create uncertainty.
Exporter does not know exactly how much foreign revenue will be worth when converted back.
Therefore:
Investment may be discouraged.
However:
Firms can hedge some risk.
Exchange Rates and Comparative Advantage
Comparative advantage is based on relative opportunity costs.
It is not created solely by exchange rates.
A depreciation can change market competitiveness.
But it does not necessarily change the underlying opportunity-cost basis of comparative advantage.
This distinction prevents conceptual errors.
Exchange Rates and Balance of Payments Adjustment
Suppose a country has a persistent current-account deficit.
Currency depreciation may:
Exports ↑
imports ↓.
Therefore:
Current-account balance may improve.
But:
Marshall-Lerner condition must be considered.
Expenditure Switching
A depreciation encourages consumers to switch expenditure:
Away from imports
towards domestic goods.
Foreign consumers may switch:
towards the country’s exports.
This is called an:
expenditure-switching effect.
Expenditure Reducing vs Switching
Expenditure-switching policy
Changes spending between domestic and foreign goods.
Example:
Exchange-rate depreciation.
Expenditure-reducing policy
Reduces total domestic expenditure.
Example:
Contractionary fiscal policy.
Both can potentially improve a current-account deficit through different channels.
Appreciation and Current-Account Surplus
If a country has very strong external demand and a large current-account surplus:
Appreciation may reduce that surplus by:
X ↓
M ↑.
However:
Again, elasticity and income effects matter.
Income Effects vs Price Effects
Trade flows depend not only on exchange rates.
Suppose SGD appreciates 5%.
But foreign income rises 15%.
Foreign consumers may still buy more Singapore exports.
Therefore:
X can increase despite appreciation.
This is a strong evaluation point.
Example
Currency appreciation:
Export price ↑ 5%.
Global recovery:
Foreign income ↑ significantly.
Demand for Singapore exports ↑ due to income effect.
Therefore:
The final export effect is ambiguous.
Exchange Rates and YED
Income elasticity of demand also matters.
If exports have high positive YED:
Strong global growth may increase export demand significantly.
Therefore:
Income effects can overwhelm modest exchange-rate effects.
Exchange Rates and PED
If Singapore’s exports are differentiated and have few close substitutes:
PED may be relatively low.
Therefore:
Appreciation may have a smaller effect on export quantity.
XED and Exchange Rates
Suppose foreign consumers see Singapore and another country’s products as close substitutes.
XED is high.
When Singapore exports become more expensive due to appreciation:
Consumers can switch easily.
Therefore:
Export demand may fall substantially.
A-Level Worked Question
Explain how an appreciation of the Singapore dollar may reduce inflation.
An appreciation increases the external value of the Singapore dollar.
Foreign goods become cheaper in SGD terms.
Therefore:
Prices of imported consumer goods may fall.
Furthermore:
Singapore firms importing:
raw materials
energy
intermediate goods
face lower production costs.
Hence:
Cost-push inflationary pressure falls.
Appreciation may also reduce export competitiveness.
Net exports ↓
→ AD ↓.
This can reduce demand-pull inflationary pressure.
Therefore:
Appreciation can reduce inflation through both:
import-price
and
aggregate-demand channels.
Evaluation
The extent depends on:
- degree of exchange-rate pass-through;
- share of imports in consumption and production;
- PED for exports/imports;
- state of domestic demand.
If retailers absorb the exchange-rate movement in profit margins:
Consumer prices may respond less.
Worked Question: Depreciation
Explain how currency depreciation may increase economic growth.
Depreciation makes domestic exports cheaper in foreign-currency terms.
Therefore:
Quantity demanded of exports may increase.
Imports become more expensive in domestic-currency terms.
Quantity demanded of imports may decrease.
Hence:
Net exports ↑.
Since:
AD = C + I + G + (X − M),
AD ↑.
Firms increase production.
Therefore:
Actual economic growth ↑.
Evaluation
If demand for exports and imports is price inelastic:
Trade volumes respond little.
Furthermore:
Imported input costs ↑.
SRAS may decrease.
Therefore:
The positive effect on real GDP may be significantly reduced.
Essay Question
“Assess whether depreciation of a currency is beneficial to an economy.”
A good answer should recognise both benefits and costs.
Benefit 1: Growth
X ↑
M ↓
→ AD ↑
→ real GDP ↑.
Benefit 2: Employment
Export output ↑
→ labour demand ↑
→ unemployment ↓.
Benefit 3: Current Account
Trade balance may improve if elasticities are sufficiently favourable.
Cost 1: Imported Inflation
Import prices ↑.
Cost 2: Production Costs
Imported inputs ↑ in price.
SRAS ↓.
Cost 3: Living Standards
Foreign products and travel become more expensive.
Purchasing power ↓.
Evaluation 1: Marshall-Lerner
Current-account improvement depends on elasticities.
Evaluation 2: J-Curve
Improvement may take time.
Evaluation 3: Imported Inputs
Exporters may face higher costs.
Evaluation 4: Spare Capacity
If full employment:
AD stimulus may mainly cause inflation.
Evaluation 5: Global Demand
Depreciation may be ineffective during severe global recession.
Judgement
Depreciation is most likely to be beneficial when:
- export/import demand is sufficiently price elastic;
- spare capacity exists;
- imported-input dependence is limited;
- foreign demand is reasonably strong.
If the economy already faces high inflation and relies heavily on imported necessities:
The costs of depreciation may outweigh its growth benefits.
Essay Question: Appreciation
“Assess whether currency appreciation is desirable for Singapore.”
Argument for
Imported goods and inputs become cheaper.
Therefore:
Imported inflation ↓.
This is particularly relevant to a highly open economy.
Further Benefit
Household purchasing power over foreign goods ↑.
Counterargument
Exports become less price competitive.
Net exports may ↓.
Growth and employment may weaken.
Evaluation
If global demand is strong and exports have low PED:
Negative growth effect may be limited.
If inflation is the more serious macroeconomic problem:
Appreciation may be appropriate.
Strong Judgement
For Singapore:
The desirability of appreciation depends heavily on the balance between:
inflation risks
and
growth risks.
When imported inflation is strong and external demand remains resilient:
A stronger exchange-rate stance may be more appropriate.
When global demand is extremely weak:
Supporting competitiveness may become more important.
Exchange-Rate Evaluation Framework: E-X-C-H-A-N-G-E
Use this for essays:
E — Elasticities
PED for exports and imports.
X — External demand
Is the global economy strong or weak?
C — Capacity
Does the domestic economy have spare capacity?
H — Horizon
Short run or long run?
A — Aggregate demand
How does NX change?
N — Necessary imported inputs
How import-dependent are producers?
G — General price level
What happens to inflation?
E — Exchange-rate pass-through
How strongly do prices actually respond?
A Simpler Framework
Use:
Currency → Export Price → Import Price → X/M → AD → Growth/Jobs/Inflation → Evaluation
This is useful under exam time pressure.
Common Student Mistakes
Mistake 1: Confusing Appreciation With Depreciation
Appreciation:
Currency stronger.
Depreciation:
Currency weaker.
Mistake 2: Saying Appreciation Makes Exports Cheaper
It normally makes exports more expensive to foreign buyers, other things equal.
Mistake 3: Saying Depreciation Makes Imports Cheaper
It makes imports more expensive domestically.
Mistake 4: Saying Depreciation Always Improves Current Account
Marshall-Lerner and J-Curve matter.
Mistake 5: Ignoring Imported Inputs
A weaker currency raises production costs for import-dependent firms.
Mistake 6: Ignoring PED
Trade quantities may respond weakly.
Mistake 7: Ignoring Time Period
Elasticities often become larger over time.
Mistake 8: Saying Currency Change Affects Only AD
Imported-input prices can also affect SRAS.
Mistake 9: Assuming Exports Depend Only on Price
Foreign income and non-price competitiveness matter.
Mistake 10: Applying Conventional Interest-Rate Policy Mechanically to Singapore
Singapore’s monetary-policy framework is exchange-rate-centred.
Mistake 11: Using SGD/USD Alone to Describe Singapore’s Overall Policy Position
Singapore’s policy framework uses a trade-weighted currency basket.
Mistake 12: Saying Strong Currency Is Always Bad for Growth
Cheaper imported capital and intermediate goods can benefit producers.
Frequently Asked Questions
What is an exchange rate?
The price of one currency expressed in another currency.
What is currency appreciation?
A rise in a currency’s external value.
What is depreciation?
A fall in a currency’s external value.
What happens to exports after appreciation?
They become more expensive to foreign buyers, other things equal.
What happens to imports after appreciation?
They become cheaper domestically.
How does appreciation reduce inflation?
It lowers import prices and imported production costs and may reduce AD.
How can depreciation increase growth?
It can raise net exports and therefore AD.
Why can depreciation cause inflation?
Imports and imported production inputs become more expensive.
What is the Marshall-Lerner condition?
A condition relating export and import demand elasticities to whether depreciation improves the trade balance.
What is the J-Curve?
The possibility that the trade balance initially worsens after depreciation before later improving.
Why is the exchange rate important in Singapore?
Singapore is highly open and imports many consumer goods and production inputs.
Does depreciation always increase real GDP?
No. Imported inflation and higher production costs can reduce the benefit.
Exchange Rates Revision Checklist
Make sure you can:
- define exchange rate;
- distinguish appreciation and depreciation;
- distinguish revaluation and devaluation;
- explain currency demand and supply;
- explain causes of appreciation;
- explain causes of depreciation;
- analyse exports;
- analyse imports;
- explain effects on net exports;
- link exchange rates to AD;
- analyse growth;
- analyse unemployment;
- explain imported inflation;
- analyse imported production costs;
- explain Marshall-Lerner;
- explain J-Curve;
- evaluate short run vs long run;
- explain exchange-rate pass-through;
- apply PED, YED and XED;
- explain Singapore’s exchange-rate-centred policy;
- distinguish price and non-price competitiveness; and
- reach a conditional judgement.
Final Takeaway
An exchange-rate movement should never be analysed using only:
“Exports increase”
or:
“Imports become cheaper.”
A complete A-Level chain is:
Appreciation
Currency value ↑
→ export prices to foreigners ↑
→ import prices domestically ↓
→ X tends to ↓
→ M tends to ↑
→ net exports ↓
→ AD ↓
→ growth may ↓
→ unemployment may ↑
but:
→ imported inflation ↓.
Depreciation
Currency value ↓
→ exports cheaper
→ imports more expensive
→ X tends to ↑
→ M tends to ↓
→ AD ↑
→ growth and employment may ↑
but:
→ imported inflation ↑.
The strongest evaluation then asks:
How elastic is demand?
How dependent are firms on imported inputs?
Is there spare capacity?
What is happening to global demand?
Is the analysis short run or long run?
For Singapore, exchange-rate analysis is especially important because a stronger Singapore dollar can help contain imported inflation, while an excessively strong currency may weaken export competitiveness.
A high-quality conclusion therefore recognises the trade-off:
The effect of an exchange-rate change depends on the economy’s structure and initial conditions. While depreciation can increase net exports and aggregate demand, its effectiveness depends on the price responsiveness of exports and imports and may be offset by higher imported production costs. Conversely, appreciation can reduce imported inflation, which is particularly relevant to an open economy such as Singapore, but may weaken external competitiveness. The appropriate exchange-rate stance therefore depends on whether inflation or weak growth is the more pressing macroeconomic problem.
Recommended internal links: Singapore Exchange Rate Policy, Inflation, Aggregate Demand and Aggregate Supply, Price Elasticity of Demand, Economic Growth, Multiplier Effect, and 50 Singapore Economics Examples.
Next article: Balance of Payments and Current Account: Complete A-Level Economics Guide with Causes, Consequences and Singapore Examples.
