6.2 - Exchange Rates
The foreign exchange market and exchange rates
The foreign exchange market is where currencies from different countries are bought and sold. This market plays a key role in international trade by allowing businesses and individuals to convert one currency into another for transactions like importing goods or traveling abroad. The interactions in this market help determine how much one currency is worth compared to others, influencing global economic flows.
Key features of the foreign exchange market
- Participants - Include banks, businesses, governments, and investors who need to exchange currencies for trade, investment, or other purposes.
- Flexible exchange rates - In most modern economies, exchange rates fluctuate based on supply and demand, without fixed government controls.
- Impact on trade - Exchange rates affect the cost of exports and imports, which in turn influences the flow of goods, services, and financial capital between countries.
What is an exchange rate?
Exchange rate refers to the price of one currency expressed in terms of another currency. For example, if 1 US dollar (USD) can be exchanged for 0.85 euros (EUR), the exchange rate is $1 = €0.85. This rate shows how much foreign currency you get for each unit of your domestic currency.
As a result, exchange rates help set the relative value of currencies, making it easier to compare prices across borders and facilitating international transactions.
Currency appreciation and depreciation
Currencies can change in value over time due to factors like supply and demand in the foreign exchange market. These changes are described using specific terms that explain whether a currency is gaining or losing worth relative to another.
Currency appreciation
Currency appreciation occurs when one currency becomes more valuable in terms of another currency. This means you need less of the appreciating currency to buy the same amount of the other currency.
Example and effects:
- If the exchange rate for USD to EUR changes from $1 = €0.85 to $1 = €0.90, the USD has appreciated because 1 USD now buys more euros.
- Appreciation makes imports cheaper for the country with the stronger currency but can make its exports more expensive and less competitive abroad.
Currency depreciation
Currency depreciation happens when one currency becomes less valuable in terms of another currency. This means you need more of the depreciating currency to buy the same amount of the other currency.
Example and effects:
- If the exchange rate for USD to EUR changes from $1 = €0.85 to $1 = €0.80, the USD has depreciated because 1 USD now buys fewer euros.
- Depreciation makes exports cheaper and more attractive to foreign buyers but increases the cost of imports for the domestic economy.
These changes arise from the interaction of buyers and sellers in the foreign exchange market, where shifts in demand for a currency can lead to appreciation or depreciation.
How currencies are valued relative to one another
Currencies are valued based on their exchange rates, which are determined in the foreign exchange market through supply and demand. This relative valuation shows how much one currency is worth compared to another, helping to establish equilibrium prices for international exchanges.
Factors influencing relative currency values
- Supply and demand - If demand for a currency increases (e.g., due to strong exports), its value rises relative to others; if supply increases (e.g., from high imports), its value falls.
- Equilibrium exchange rate - This is the rate where the quantity of a currency demanded equals the quantity supplied, balancing the market.
- Relative strength - A currency's value is always compared to another; for instance, if the USD appreciates against the EUR, it means the USD is stronger relative to the EUR.
This relative approach ensures that currencies reflect economic conditions, affecting trade balances and capital flows between countries.
Calculating the value of one currency relative to another
To find the value of one currency in terms of another, use the exchange rate for direct conversions. This calculation is essential for understanding trade costs and financial transactions.
Formula for converting to foreign currency
Where:
- Amount in base currency = The starting amount in the domestic currency (e.g., USD)
- Exchange rate = The rate expressed as foreign currency per unit of base currency (e.g., € per $)
Formula for converting to base currency
Where:
- Amount in foreign currency = The starting amount in the foreign currency (e.g., EUR)
- Exchange rate = The rate expressed as foreign currency per unit of base currency (e.g., € per $)
These formulas help quantify how exchange rates translate into real values, supporting decisions in international economics.
Worked example - Converting currencies using exchange rates
A US company needs to pay a European supplier €1,200 for goods. The current exchange rate is $1 = €0.85. Calculate how many USD are needed to make this payment. Then, if the company receives a refund of €300 at the same rate, calculate the USD equivalent.
Step 1: Identify the values
- Amount to pay = €1,200
- Refund amount = €300
- Exchange rate = $1 = €0.85
Step 2: Convert euros to USD for payment
Amount in USD = €1,200 ÷ 0.85 = $1,411.76
Step 3: Convert euros to USD for refund
Amount in USD = €300 ÷ 0.85 = $352.94
Step 4: Interpretation
The company needs $1,411.76 to cover the €1,200 payment, and the €300 refund is worth $352.94 in USD at this exchange rate.
Worked example - Calculating relative value after appreciation
Suppose the exchange rate between USD and Japanese yen (JPY) is initially $1 = ¥110. After appreciation of the USD, the rate becomes $1 = ¥115. Calculate the value of ¥2,300 in USD at both rates and explain the change.
Step 1: Identify the values
- Amount = ¥2,300
- Initial exchange rate = $1 = ¥110
- New exchange rate = $1 = ¥115
Step 2: Calculate at initial rate
Value in USD = ¥2,300 ÷ 110 = $20.91
Step 3: Calculate at new rate
Value in USD = ¥2,300 ÷ 115 = $20.00
Step 4: Interpretation
The value drops from $20.91 to $20.00 due to USD appreciation, meaning fewer USD are needed to buy the same amount of JPY, making Japanese goods cheaper for US buyers.