Types of exchange rate systems

Exchange rate systems determine how the value of a currency is set relative to others. They influence international trade, inflation, economic growth, and the balance of payments.

Main types of exchange rate systems

• Fixed exchange rate - The government or central bank establishes and maintains a specific value for the currency against another currency or a basket of currencies.
• Floating exchange rate - The currency's value is determined by market forces of supply and demand, allowing it to fluctuate freely without direct government control.

Hybrid exchange rate systems

• Managed floating - The exchange rate is mostly set by market supply and demand, but governments or central banks intervene occasionally to stabilise extreme fluctuations.
• Semi-fixed - The currency can vary within a predefined range or band, providing some flexibility while maintaining overall stability.
• Pegged - The currency is linked to another currency or group of currencies, with periodic adjustments to reflect economic changes.

Maintaining fixed exchange rates

In fixed and some hybrid systems, a target exchange rate is set to ensure stability. Governments and central banks use various tools to keep the currency at this level, balancing supply and demand.

Methods used to maintain target rates

• Interest rate adjustments - Raising interest rates can attract foreign investment, increasing demand for the currency and supporting its value.
• Currency market interventions - Buying the domestic currency with foreign reserves reduces its supply, helping to increase its value; selling it increases supply to lower the value.
• Foreign currency reserves - These are held to enable buying or selling in the market, ensuring the exchange rate stays close to the target.

Measuring and fluctuating exchange rates

Exchange rates can be measured in different ways to reflect economic realities, and they fluctuate due to various factors.

Ways of measuring exchange rates

• Nominal exchange rate - A straightforward comparison of currency values without adjustments, such as £1 = €1.25.
• Real exchange rate - The nominal rate adjusted for differences in price levels between countries, using price indices to show true purchasing power.
• Bilateral exchange rate - Compares two specific currencies directly.
• Effective exchange rate - Measures a currency against a weighted average of several trading partners' currencies, providing a broader view of overall value.

Terminology for exchange rate fluctuations

• Devaluation - A deliberate reduction in a fixed exchange rate by the government, often achieved by selling the currency.
• Revaluation - An intentional increase in a fixed exchange rate, typically by buying the currency.
• Depreciation - A market-driven fall in a floating exchange rate.
• Appreciation - A market-driven rise in a floating exchange rate.
• Competitive devaluation - Intentional lowering of a currency's value to boost export competitiveness.
• Competitive depreciation - Indirect government actions to decrease a floating currency's value for similar competitive gains.

Determinants of supply and demand in floating exchange rates

• Speculation - Traders buy or sell currencies based on expected future movements, influencing short-term demand.
• Government intervention - Central banks may buy or sell currencies to guide market trends.
• Relative inflation rates - Higher domestic inflation compared to trading partners reduces currency demand, leading to depreciation.
• Relative interest rates - Higher interest rates draw in foreign capital, boosting currency demand and causing appreciation.
• Economic confidence - Strong growth and stability increase demand for the currency, while uncertainty reduces it.
• Current account balance - A deficit increases currency supply through more imports, often causing depreciation.

Advantages and disadvantages of fixed and floating exchange rates

Different exchange rate systems offer benefits and drawbacks, affecting economic policy, business planning, and international trade. The choice depends on a country's economic priorities and stability.

Advantages of floating exchange rates

• Balance of payments - Helps correct deficits automatically through market adjustments.
• Monetary policy - Allows flexibility to pursue domestic goals like controlling inflation.
• Market efficiency - May discourage excessive speculation if rates reflect true market conditions.

Disadvantages of floating exchange rates

• Speculation - Can lead to overvaluation, harming export competitiveness.
• Uncertainty - Sharp fluctuations create uncertainty for businesses and investors.
• Imported inflation - Can cause imported inflation if depreciation occurs and import demand is inelastic.

Advantages of fixed exchange rates

• Competitiveness - Encourages domestic firms to improve efficiency under stable conditions.
• Investment - Provides predictability, boosting foreign and domestic investment.
• Reserve efficiency - Requires fewer reserves than constant intervention in floating systems.

Disadvantages of fixed exchange rates

• Speculative attacks - Susceptible to speculative attacks if the rate seems unsustainable.
• Monetary policy constraints - Limits independent monetary policy, as interest rates must support the fixed rate.
• Sustainability - Challenging to sustain over long periods due to changing economic conditions.

Economic impacts of exchange rate changes

Changes in exchange rates affect key economic indicators, including trade balances, growth, employment, and inflation. The effects depend on whether the currency strengthens or weakens, and on factors like price elasticities.

Effects of currency depreciation or devaluation

• Trade impacts - Exports become cheaper and more competitive abroad, while imports grow more expensive, potentially reducing current account deficits if the Marshall-Lerner condition holds (sum of price elasticities of demand for imports and exports > 1).
• Economic growth - Increased export demand boosts aggregate demand, stimulating output and potentially lowering unemployment through new jobs.
• Inflation risks - Higher import prices can lead to cost-push inflation, especially if demand for imports is price inelastic.
• J-curve effect - Initially, the current account may worsen as import and export demands are inelastic in the short run; over time, adjustments lead to improvement as behaviours change.

Effects of currency appreciation or revaluation

• Trade impacts - Exports become more expensive and less competitive, while cheaper imports may widen current account deficits.
• Economic growth - Reduced export demand can lower aggregate demand, potentially slowing growth and increasing unemployment.
• Inflation effects - Cheaper imports may reduce inflationary pressures, but this depends on the elasticity of demand for both imports and domestic goods.