Foreign exchange rates

1. Overview

A foreign exchange rate is the price of one currency expressed in terms of another. It acts as the primary link between different national economies, determining the relative cost of every international transaction, from the price of a holiday abroad to the cost of industrial raw materials. In a globalized economy, exchange rates are a critical determinant of a country's international competitiveness, its rate of inflation, and its overall balance of payments. Governments and central banks must decide whether to let market forces dictate the value of their currency or to intervene to maintain a specific price level to achieve economic stability.

Key Definitions

• Exchange Rate: The value of one currency for the purpose of conversion to another (e.g., US$1 USD = €0.92 EUR).
• Floating Exchange Rate: A system where the currency value is determined by the market forces of demand and supply without government or central bank intervention.
• Fixed Exchange Rate: A system where the government or central bank ties (pegs) the value of the domestic currency to another currency (like the US Dollar) or a basket of currencies.
• Appreciation: An increase in the value of a currency within a floating exchange rate system.
• Depreciation: A decrease in the value of a currency within a floating exchange rate system.
• Revaluation: A deliberate upward adjustment of a currency’s official exchange rate by the government in a fixed system.
• Devaluation: A deliberate downward adjustment of a currency’s official exchange rate by the government in a fixed system.
• Foreign Exchange Market (Forex): The global decentralized market where currencies are traded 24/7.
• Hot Money: Capital that moves frequently and quickly between financial markets to take advantage of high interest rates or expected exchange rate shifts.

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Core Content

A. Determination of Floating Exchange Rates

In a floating system, the exchange rate is the equilibrium price where the quantity of currency demanded equals the quantity supplied.

The Demand for a Currency (e.g., Demand for the British Pound £): Demand comes from foreign residents who need the currency to:

• Buy domestic exports: Foreigners must buy Pounds to pay UK exporters.
• Inward Foreign Direct Investment (FDI): Foreign firms buying land or factories in the UK.
• Save in domestic banks: Attracted by high domestic interest rates.
• Tourism: Foreign tourists spending money within the country.

The Supply of a Currency (e.g., Supply of the British Pound £): Supply comes from domestic residents who sell their currency to:

• Buy foreign imports: UK residents sell Pounds to buy Dollars/Euros to pay foreign firms.
• Outward Investment: Domestic firms buying assets abroad.
• Travel abroad: Domestic tourists spending money in other countries.

The Forex Diagram:

• Y-axis: Exchange Rate (Price of Currency A in terms of Currency B).
• X-axis: Quantity of Currency A.
• Demand Curve: Slopes downward. As the exchange rate falls, the currency becomes "cheaper" for foreigners, making domestic goods cheaper, thus increasing the quantity demanded.
• Supply Curve: Slopes upward. As the exchange rate rises, foreign goods become "cheaper" for domestic residents, encouraging them to sell more domestic currency to buy imports.

B. Factors Causing Shifts in Exchange Rates

Factor	Change	Impact on Currency	Chain of Reasoning
Interest Rates	Increase	Appreciation	Higher rates → Attracts "Hot Money" inflows → Increased demand for currency → Value rises.
Inflation	Increase (Relative)	Depreciation	Domestic goods become more expensive/less competitive → Exports fall (Demand ↓) and Imports rise (Supply ↑) → Value falls.
Demand for Exports	Increase	Appreciation	Better quality/marketing of domestic goods → Foreigners buy more → Increased demand for currency → Value rises.
Speculation	Expected Rise	Appreciation	Speculators buy the currency now to profit later → Current demand increases → Value rises immediately.
Economic Growth	Strong Growth	Appreciation	High growth suggests stability and high future returns → Attracts FDI → Increased demand for currency → Value rises.

Worked example 1 — Analyzing the impact of inflation

Question: Explain how a significant increase in a country's inflation rate, relative to its trading partners, is likely to affect its exchange rate.

Model Answer: A high relative inflation rate means that the prices of domestic goods and services are rising faster than those in other countries. This makes domestic exports more expensive and less competitive on the global market. Consequently, foreign demand for these exports will fall, leading to a decrease in the demand for the domestic currency. At the same time, foreign-produced goods become relatively cheaper for domestic consumers, leading to an increase in the demand for imports. To buy these imports, domestic residents must sell more of their own currency, increasing the supply of the currency on the foreign exchange market. The combination of decreased demand and increased supply will cause the exchange rate to depreciate.

C. Floating vs. Fixed Exchange Rates (Evaluation)

Floating Exchange Rate System

• Advantage: Automatic Correction. If a country has a large trade deficit, its currency will naturally depreciate. This makes exports cheaper and imports more expensive, which should eventually reduce the deficit.
• Advantage: Policy Independence. The Central Bank does not need to use interest rates to "defend" the currency value. It can set interest rates solely to manage domestic inflation or unemployment.
• Disadvantage: Uncertainty. Constant fluctuations make it difficult for businesses to predict future costs and revenues, which can discourage international trade and long-term investment.
• Disadvantage: Lack of Discipline. Governments may follow inflationary policies (like printing money) because there is no requirement to maintain a specific exchange rate.

Fixed Exchange Rate System

• Advantage: Stability and Certainty. Businesses face no exchange rate risk. This encourages long-term contracts, trade, and Foreign Direct Investment (FDI) because profit margins are predictable.
• Advantage: Low Inflation. To maintain the peg, the government must keep inflation low (similar to the country they are pegged to), which imposes "monetary discipline."
• Disadvantage: Loss of Monetary Policy. Interest rates must be used to maintain the exchange rate. If the currency is depreciating, the Central Bank must raise interest rates even if the domestic economy is in a recession.
• Disadvantage: Need for Foreign Reserves. The Central Bank must hold large amounts of foreign currency (e.g., US Dollars) to buy its own currency if the value starts to drop. This is an "opportunity cost" as those funds could be used elsewhere.

Worked example 2 — Evaluating a change in system

Question: Evaluate whether a small, developing economy should move from a fixed exchange rate to a floating exchange rate.

Model Answer: Moving to a floating exchange rate would allow the country's Central Bank to have monetary policy autonomy. This means they could lower interest rates to stimulate economic growth during a downturn without worrying about the exchange rate falling. Additionally, a floating rate acts as an automatic stabilizer; if the country's main export (e.g., coffee) falls in price, the currency will depreciate, making other exports more competitive and helping to balance the trade account.

However, a floating rate introduces volatility. For a developing economy that relies on importing essential machinery or fuel, a sudden depreciation could lead to imported inflation, making production more expensive and reducing the standard of living. Furthermore, the uncertainty of a floating rate might deter foreign investors who prefer the predictability of a fixed peg. In conclusion, while a floating rate provides flexibility, a small economy might benefit more from a fixed rate to provide the stability necessary to attract investment, provided they have enough foreign reserves to maintain the peg.

D. Impact of Exchange Rate Changes

1. Impact of Appreciation (Stronger Currency)

• Acronym: SPICED (Strong Pound Imports Cheap Exports Dear).
• On Inflation: Appreciation lowers inflation. Imports (raw materials and finished goods) become cheaper, reducing cost-push inflation.
• On Economic Growth: May slow down. Exports become more expensive for foreigners, leading to lower demand for domestic products and potentially higher unemployment in export-oriented industries.
• On Balance of Payments: Usually leads to a worsening of the Current Account (Exports ↓, Imports ↑).

2. Impact of Depreciation (Weaker Currency)

• Acronym: WIDEC (Weak Imports Dear Exports Cheap).
• On Inflation: Depreciation increases inflation. The cost of imported oil, food, and components rises, leading to higher prices for consumers.
• On Economic Growth: Can stimulate growth. Exports become more price-competitive abroad, increasing demand for domestic labor and boosting GDP.
• On Balance of Payments: Usually leads to an improvement in the Current Account (Exports ↑, Imports ↓), provided the country has the capacity to produce more exports.

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Extended Content

Note: There is no separate "Extended" content for this topic. All students must be able to analyze the determination of rates, the factors causing shifts, and evaluate the different systems and their impacts on macroeconomic objectives.

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Key Equations

1. Currency Conversion (Domestic to Foreign) $$\text{Foreign Currency Amount} = \text{Domestic Currency Amount} \times \text{Exchange Rate}$$ Example: If $£1 = \US$1.25$, then $£400$ is worth $\US$500$ ($400 \times 1.25$).

2. Currency Conversion (Foreign to Domestic) $$\text{Domestic Currency Cost} = \frac{\text{Foreign Price}}{\text{Exchange Rate}}$$ Example: If $£1 = €1.10$, a machine costing $€2,200$ will cost a UK firm $£2,000$ ($2,200 / 1.10$).

3. Percentage Change in Exchange Rate $$% \text{ Change} = \frac{\text{New Rate} - \text{Old Rate}}{\text{Old Rate}} \times 100$$

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Common Mistakes to Avoid

• Confusing Terms:
  • Appreciation/Depreciation = Market forces (Floating).
  • Revaluation/Devaluation = Government action (Fixed).
  • Do not use them interchangeably in long-answer questions.
• The "Strong is Good" Fallacy: Students often assume a strong currency is always better. Remember: A strong currency hurts exporters and can lead to higher unemployment in the manufacturing sector.
• Ignoring the "Why": When explaining a shift, don't just say "demand increases." Explain why (e.g., "Because domestic interest rates rose, attracting hot money inflows").
• Axis Labeling: On a Forex diagram, the Y-axis is not just "Price." It must be "Price of Currency A in terms of Currency B" or "Exchange Rate ($/£)."

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Exam Tips

• Chain of Reasoning: For "Analyze" questions, use a step-by-step approach.
  • Example: Interest rates rise → Hot money inflows → Demand for currency increases → Currency appreciates → Export prices rise → Export volume falls.
• The "Depends On" Factor: For "Evaluate" questions, consider the Price Elasticity of Demand (PED). A depreciation only improves the trade balance if the demand for exports and imports is relatively elastic. If people must buy imported oil regardless of price (inelastic), a depreciation might actually make the trade deficit worse in the short term.
• Link to Other Topics: Exchange rates are rarely tested in isolation. Be ready to link them to:
  • Inflation: (Imported inflation vs. lower costs).
  • Employment: (Export sector jobs).
  • Balance of Payments: (The Current Account).
• Multiple Choice (Paper 1): If you see a question about interest rates and exchange rates, remember: Higher Interest = Higher Exchange Rate (due to demand for the currency to save in that country's banks).

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Exam-Style Questions

Practice these original exam-style questions to test your understanding. Each question mirrors the style, structure, and mark allocation of real Cambridge 0455 papers.

Exam-Style Question 1 — Short Answer [6 marks]

Paper 2 (Calculator Allowed)

Question:

The country of Zandia uses the Zandu (Z) as its currency. In 2024, the exchange rate between the Zandu and the US Dollar (US$) changed from 1$ = 8Z to 1$ = 10Z.

(a) Identify whether the Zandu has appreciated or depreciated against the US Dollar. [1]

(b) Explain two likely impacts of this change in the exchange rate on Zandia's exports. [5]

Worked Solution:

(a) The Zandu has depreciated against the US Dollar. $\boxed{}$ [B1] The Zandu now buys fewer dollars, meaning it has depreciated.

How to earn full marks: Simply state the correct term: "appreciated" or "depreciated". No explanation is needed for this part.

(b)

1. Zandia's exports will likely become cheaper for US consumers to buy. This is because US consumers can now buy more Zandu for each dollar, effectively lowering the price of Zandian goods and services when expressed in US dollars. [M1] Explains the mechanism by which exports become cheaper.
2. As Zandian exports become cheaper, the quantity demanded by US consumers will likely increase. Assuming demand is relatively elastic, this should lead to an increase in the value of Zandia's exports. [A1] Links the cheaper exports to increased demand and export value.
3. However, the impact on the value of exports is not guaranteed. If demand is inelastic, the increase in quantity demanded may not offset the lower price, resulting in a fall in export revenue. [M1] Introduces the possibility of inelastic demand.
4. Another impact is that Zandian firms exporting to the US will receive fewer Zandu for each dollar earned. This could reduce their profits and potentially lead to lower investment and employment in Zandia's export industries. [A1] Explains the impact on Zandian exporters' revenue.
5. In summary, depreciation makes exports cheaper (for foreign buyers) and imports more expensive (for domestic buyers), impacting trade balance and domestic businesses. $\boxed{}$ [A1] Summarizes the effects of depreciation.

How to earn full marks: For each impact, explain the mechanism by which the exchange rate change affects exports, and consider both potential positive and negative effects.

Common Pitfall: Be sure to clearly explain the mechanism by which a change in the exchange rate affects exports. Don't just state that exports will increase or decrease; explain why this will happen in terms of price changes and consumer behavior.

Exam-Style Question 2 — Short Answer [5 marks]

Paper 2 (Calculator Allowed)

Question:

The government of the island nation of Pacifica maintains a fixed exchange rate for its currency, the Pacifican Peso (P), against the Euro (€).

(a) Define the term "fixed exchange rate". [2]

(b) Explain one potential advantage and one potential disadvantage for Pacifica of maintaining a fixed exchange rate. [3]

Worked Solution:

(a) A fixed exchange rate is a system where a country's government or central bank ties the official exchange rate to another country's currency or the price of a commodity like gold. $\boxed{}$ [B1] Identifies the core concept of a fixed exchange rate. The value of the currency is set and maintained by the government, usually through intervention in the foreign exchange market. $\boxed{}$ [B1] Explains how the fixed rate is maintained.

How to earn full marks: Provide a complete definition that includes both the pegging of the currency and the method of maintaining the rate.

(b)

1. One potential advantage is that it provides stability and certainty for businesses involved in international trade. [M1] Identifies stability as an advantage. This reduces exchange rate risk, encouraging investment and trade, as firms can predict future costs and revenues more accurately. $\boxed{}$ [A1] Explains how stability encourages investment and trade.
2. One potential disadvantage is that the government must hold large reserves of foreign currency to defend the fixed exchange rate. This can be costly and divert resources from other areas of the economy, such as healthcare or education. [M1] Identifies the need for large reserves as a disadvantage. If the fixed exchange rate is set too high, the central bank will need to continuously intervene to buy its own currency to maintain the peg. This is expensive and unsustainable in the long run. $\boxed{}$ [A1] Explains the cost and potential unsustainability of defending the fixed rate.

How to earn full marks: For both the advantage and disadvantage, clearly state the point, then explain why it is an advantage or disadvantage with a relevant example.

Common Pitfall: When discussing advantages and disadvantages, make sure you explain why something is an advantage or disadvantage. For example, don't just say "stability is an advantage"; explain how stability benefits businesses and the economy.

Exam-Style Question 3 — Extended Response [10 marks]

Paper 2 (Calculator Allowed)

Question:

The country of Economia has experienced a significant increase in its interest rates, attracting foreign investment.

(a) Analyse the likely impact of this increase in interest rates on the exchange rate of Economia's currency. [6]

(b) Discuss the potential effects of this change in the exchange rate on Economia's current account balance. [4]

Worked Solution:

(a)

1. Higher interest rates in Economia will make it more attractive for foreign investors to deposit their money in Economian banks. [M1] Explains the initial impact on foreign investment.
2. This increased demand for Economia's assets leads to an increased demand for Economia's currency. [A1] Links foreign investment to currency demand.
3. As the demand for Economia's currency increases, the value of the currency will appreciate. This is because there are now more buyers of the currency than sellers. [A1] Explains how increased demand leads to appreciation.
4. The extent of the appreciation will depend on the size of the interest rate increase, the relative attractiveness of investment opportunities in other countries, and the expectations of future exchange rate movements. [A1] Identifies factors influencing the extent of appreciation.
5. If the interest rate increase is seen as temporary, the appreciation may be short-lived. Speculators may buy the currency now to profit from the higher interest rates, but sell it as soon as they expect the interest rates to fall. [A1] Explains the impact of temporary interest rate changes.
6. Conversely, if the interest rate increase is seen as permanent, the appreciation may be more sustained. Long-term investors may be attracted by the higher returns and be less likely to sell their holdings. $\boxed{}$ [A1] Explains the impact of permanent interest rate changes.

How to earn full marks: Clearly explain the chain of events from higher interest rates to increased demand for the currency, leading to appreciation, and consider the role of investor expectations.

(b)

1. An appreciation of Economia's currency will make its exports more expensive for foreign buyers. [M1] Explains the impact of appreciation on exports. This is because foreign buyers will need to spend more of their currency to buy Economia's currency in order to purchase Economian goods and services. As a result, the quantity of Economia's exports is likely to fall. [A1] Links more expensive exports to a fall in quantity demanded.
2. At the same time, the appreciation will make imports cheaper for Economian consumers. This is because Economian consumers will need to spend less of their currency to buy foreign currency in order to purchase foreign goods and services. As a result, the quantity of Economia's imports is likely to rise. [M1] Explains the impact of appreciation on imports.
3. Therefore, the appreciation of Economia's currency is likely to worsen its current account balance, as exports fall and imports rise. However, the extent of the impact will depend on the price elasticity of demand for exports and imports. $\boxed{}$ [A1] Links changes in exports and imports to the current account balance and considers elasticity.

How to earn full marks: Discuss the impact on both exports and imports, and link these changes to the overall current account balance, mentioning the importance of elasticity.

Common Pitfall: Remember to consider both the impact on exports and imports when analyzing the effects of an exchange rate change on the current account. Many students only focus on one side of the trade balance.

Exam-Style Question 4 — Extended Response [12 marks]

Paper 2 (Calculator Allowed)

Question:

The government of the country of Northwood is considering devaluing its currency, the Northwoodian Dollar (N$).

(a) Explain the likely effects of a devaluation of the N$ on Northwood's domestic inflation rate. [6]

**(b) Evaluate whether a devaluation of the N$ is likely to improve Northwood's economic performance. [6]

Worked Solution:

(a)

1. A devaluation of the N$ means that the N$ is now worth less relative to other currencies. [B1] Defines devaluation. This immediately makes imports into Northwood more expensive. [A1] Explains the immediate impact on import prices.
2. The higher price of imported raw materials and components will increase the costs of production for Northwoodian firms. [M1] Explains the impact on firms' costs. These firms are likely to pass on these higher costs to consumers in the form of higher prices, leading to cost-push inflation. [A1] Links higher costs to cost-push inflation.
3. Furthermore, a devaluation will increase the price of imported consumer goods, leading to imported inflation. Consumers who previously bought imported goods will now have to pay more for them. [M1] Explains the impact on consumer prices and imported inflation.
4. However, the impact on inflation will depend on the extent of the devaluation, the proportion of imports in the economy, and the price elasticity of demand for imports. If demand for imports is inelastic, the increase in import prices may be significant, leading to a larger increase in inflation. $\boxed{}$ [A1] Considers factors influencing the magnitude of inflation.

How to earn full marks: Explain how devaluation leads to both cost-push and imported inflation, and consider factors that might influence the magnitude of the inflationary effect.

(b)

1. A devaluation can improve Northwood's economic performance by making its exports more competitive. This can lead to an increase in export revenue and a reduction in the trade deficit. [M1] Explains how devaluation can improve export competitiveness. Increased export revenue can boost domestic production, employment, and economic growth. [A1] Links increased exports to economic growth.
2. However, the impact on economic performance will depend on several factors. Firstly, the price elasticity of demand for exports must be relatively elastic for export revenue to increase significantly. [M1] Considers the importance of elastic demand for exports. Secondly, the Marshall-Lerner condition must hold, meaning that the sum of the price elasticities of demand for exports and imports must be greater than one for the trade balance to improve. [A1] Introduces the Marshall-Lerner condition.
3. Furthermore, a devaluation can lead to higher inflation, which can erode consumer purchasing power and reduce living standards. Higher inflation can also make it more difficult for Northwood to attract foreign investment. [M1] Explains the negative impact of inflation.
4. In conclusion, whether a devaluation improves Northwood's economic performance depends on the specific circumstances of the country. If the conditions for improved export performance are met and the inflationary pressures are manageable, a devaluation may be beneficial. However, if the conditions are not met or inflation becomes a major problem, a devaluation may do more harm than good. $\boxed{}$ [A1] Provides a balanced conclusion considering both benefits and drawbacks.

How to earn full marks: Discuss both the potential benefits (increased exports, economic growth) and costs (increased inflation) of devaluation, and reach a reasoned conclusion based on specific conditions like elasticity and the Marshall-Lerner condition.

Common Pitfall: When evaluating the effects of a devaluation, remember to consider both the potential benefits (increased exports) and the potential costs (increased inflation). A good answer will weigh these factors against each other.