Types of exchange rate systems

Exchange rates represent the value of one currency in terms of another and play a key role in shaping economic growth, inflation levels, and the balance of payments. Governments can choose to fix these rates or let them be determined by market forces, with some systems blending both approaches.

Main types of exchange rate systems

• Fixed exchange rate system - The government or central bank establishes and maintains a specific exchange rate target, using tools like interest rate adjustments or buying and selling currency reserves to balance supply and demand.
• Floating exchange rate system - The currency's value fluctuates freely based on market supply and demand, without regular government intervention.

Hybrid exchange rate systems

These combine elements of fixed and floating systems to provide stability while allowing some flexibility:

• Managed floating - The rate is mostly set by market forces, but the government steps in occasionally to prevent extreme volatility or economic disruptions.
• Semi-fixed - The currency can vary within a predefined range, with intervention if it moves outside these limits.
• Pegged - The currency is linked to another currency or a basket of currencies, with periodic adjustments to reflect economic changes.

Methods of measuring exchange rates

Exchange rates can be assessed in different ways to provide a clearer picture of currency values:

• Nominal exchange rate - A straightforward comparison of currency values without adjustments for other factors.
• Real exchange rate - The nominal rate modified to reflect differences in price levels between countries.
• Bilateral exchange rate - A direct comparison between two currencies, such as the Canadian dollar against the Mexican peso.
• Effective exchange rate - A weighted average comparing one currency to a group of trading partners' currencies.

Key terminology in exchange rates

• Devaluation - A deliberate reduction in the value of a fixed exchange rate by government action, often through selling the currency.
• Revaluation - An intentional increase in a fixed exchange rate, typically by buying the currency.
• Depreciation - A decline in the value of a currency under a floating system.
• Appreciation - An increase in the value of a currency in a floating system.
• Competitive devaluation or depreciation - A strategic lowering of a currency's value to enhance export competitiveness.

Fixed and floating exchange rates

Different exchange rate systems offer distinct benefits and drawbacks, influencing how countries manage their economies.

Advantages of floating exchange rates

• They can automatically correct imbalances in the balance of payments by adjusting to deficits.
• Governments gain flexibility to pursue other monetary policy goals, such as controlling inflation.
• The system adapts naturally to shifts in economic conditions without constant intervention.

Disadvantages of floating exchange rates

• Significant swings in rates can complicate long-term planning for businesses.
• Speculative activities may drive the currency value up artificially, reducing export competitiveness.
• A sharp drop in the currency can fuel inflation, especially if demand for imports remains strong despite higher prices.

Advantages of fixed exchange rates

• They provide predictability, which can boost investment by reducing uncertainty.
• Domestic firms face pressure to remain efficient and competitive internationally.
• They help stabilise inflation by linking the currency to a stronger, low-inflation one.

Disadvantages of fixed exchange rates

• Maintaining the rate requires substantial reserves of foreign currency.
• Governments sacrifice control over domestic interest rates to support the fixed rate.
• Long-term sustainability is challenging due to evolving economic pressures.

Factors influencing floating exchange rates

In a floating system, exchange rates are shaped by the interplay of supply and demand for the currency, driven by various economic elements.

Key factors affecting supply and demand

• Speculation - Traders' expectations of future rate changes can shift demand, pushing rates up or down.
• Government or central bank intervention - Occasional actions, like buying or selling currency, can influence rates to avoid shocks.
• Relative inflation rates - Higher inflation in one country erodes its currency's value compared to lower-inflation nations.
• Relative interest rates - Higher domestic rates attract foreign investment, increasing demand for the currency.
• Economic confidence - Strong investor trust in an economy boosts demand for its currency.
• Current account balance - A surplus strengthens the currency, while a deficit can weaken it due to higher demand for foreign currencies.

Economic impacts of currency appreciation and depreciation

Changes in a currency's value have wide-ranging effects on trade, growth, and employment, depending on whether the currency rises or falls.

Impacts of currency depreciation

• Exports gain a price advantage, becoming more affordable and competitive abroad.
• Imports cost more, which may encourage domestic substitution.
• The current account deficit tends to narrow as export volumes rise and import volumes fall.
• Overall economic activity can increase, supporting growth and lowering unemployment.
• Inflation may rise due to elevated prices of imported goods and materials.

Impacts of currency appreciation

• Exports lose competitiveness as they become pricier for foreign buyers.
• Imports are cheaper, benefiting consumers and import-dependent businesses.
• The current account position may deteriorate with reduced export earnings and increased import spending.
• Aggregate demand could decrease, potentially slowing growth and raising unemployment.

The Marshall-Lerner condition and J-curve effect

These concepts explain how currency changes affect the balance of payments, highlighting conditions for improvement and short-term patterns.

The Marshall-Lerner condition

This condition states that a currency depreciation will only improve the current account if the combined price elasticities of demand for exports and imports are greater than 1.

$\text{Price elasticity of demand for exports}+\text{price elasticity of demand for imports}>1$

If the sum is less than 1, depreciation could worsen the current account.

The J-curve effect

Following a depreciation, the current account often deteriorates initially before improving, forming a 'J' shape on a graph.

• Short-run worsening - Demand for imports and exports is inelastic at first, so higher import costs outweigh export gains.
• Long-run improvement - Over time, demand becomes more elastic as consumers and businesses adjust, leading to higher export volumes and lower import volumes.