Introduction: Welcome to the World of Global Money!
Ever wondered why the price of a holiday to Spain changes from year to year, or why a new iPhone might suddenly get more expensive? The answer lies in exchange rates. In this chapter, we’ll explore how different currencies (like the Pound, Dollar, or Euro) are traded and how their "price" is decided. Don’t worry if this seems a bit confusing at first—just think of an exchange rate as the "price of one money in terms of another!"
1. What is an Exchange Rate?
An exchange rate is simply the value of one currency for the purpose of conversion to another. For example, if the exchange rate is \( £1 = \$1.25 \), it means you need 1 British Pound to buy 1.25 US Dollars.
How to Calculate Exchange Rates
In your exam, you might need to convert prices between currencies. Here is a simple way to remember how:
- To change Home Currency to Foreign Currency: Multiply by the exchange rate.
- To change Foreign Currency to Home Currency: Divide by the exchange rate.
Example: You have £100 and the rate is \( £1 = €1.10 \).
Calculation: \( 100 \times 1.10 = €110 \).
Quick Review: The "Price" Analogy
Think of the Pound like a chocolate bar. If the price of a Pound is $1.20 today and $1.30 tomorrow, the Pound has become "more expensive" or appreciated. If the price falls to $1.10, it has depreciated.
Key Takeaway: An exchange rate is the price of one currency expressed in another. Use multiplication to go "out" to a foreign currency and division to come "back" home.
2. Floating Exchange Rates
In a floating exchange rate system, the value of the currency is decided entirely by demand and supply in the foreign exchange market (FOREX). The government does not interfere.
The Diagram: Determination of Floating Rates
Imagine a standard Supply and Demand diagram, but the vertical axis is the "Exchange Rate" and the horizontal axis is the "Quantity of Currency."
- Demand for £: Created by people who want to buy UK goods (exports) or invest in UK banks.
- Supply of £: Created by UK citizens who want to buy foreign goods (imports) or put money in foreign banks.
What causes the rate to move?
1. Demand shifts right (Appreciation): If UK interest rates rise, foreign investors want to save their money in UK banks. They must buy Pounds to do this, so Demand for £ increases, and the price (exchange rate) goes up.
2. Supply shifts right (Depreciation): If UK citizens suddenly want to buy more Japanese cars, they must sell their Pounds to buy Yen. The Supply of £ on the market increases, and the price falls.
Key Takeaway: Floating rates are like fruit prices at a market—they change every second based on how many people want to buy or sell.
3. Fixed Exchange Rates
A fixed exchange rate system is where the government or Central Bank ties the value of their currency to another (like the US Dollar) or to gold. They "peg" the rate at a specific level.
How do they keep it fixed?
If the market tries to push the value of the currency down, the Central Bank must act to stop it:
- Using Foreign Reserves: The Central Bank uses its "piggy bank" of foreign currency to buy its own currency back, increasing demand and propping up the price.
- Changing Interest Rates: They can raise interest rates to attract foreign investors, which increases demand for the currency.
Key Takeaway: Fixed rates provide certainty for businesses but require the Central Bank to have lots of "spare cash" (reserves) to maintain the peg.
4. Causes of Exchange Rate Changes
Why do rates actually move? You can remember the main factors using the mnemonic T.I.R.E.:
- T - Trade: If a country sells lots of exports, demand for its currency rises.
- I - Interest Rates: Higher interest rates attract "Hot Money" (short-term investment), increasing demand for the currency.
- R - Relative Inflation: If UK inflation is very high, UK goods become expensive and uncompetitive. Demand for £ falls because nobody wants to buy our expensive exports.
- E - Expectations/Speculation: If traders think the Pound will rise tomorrow, they will buy it today, actually causing it to rise!
Did you know? Over 90% of currency trading is "speculation"—people buying and selling just to make a profit on the price change, not to buy actual goods!
5. Consequences of Exchange Rate Changes
When a currency changes value, it creates winners and losers. We use the mnemonic SPICED to remember the effect of a stronger currency:
Strong Pound Imports Cheap Exports Dear (Expensive)
Effect of an Appreciation (Stronger Currency):
- Exports: Become more expensive for foreigners. We sell less. (Bad for trade balance).
- Imports: Become cheaper for us. We buy more. (Bad for trade balance, but good for consumers).
- Inflation: Tends to fall because imported raw materials (like oil) are cheaper.
- Economic Growth: May slow down because we are selling fewer exports.
Effect of a Depreciation (Weaker Currency):
The opposite happens! Exports become cheaper (W.P.I.D.E.C. - Weak Pound Imports Dear Exports Cheap). This usually helps the Current Account balance as we sell more abroad and buy fewer expensive imports.
Common Mistake: Students often think a "Strong" currency is always "Good." Not necessarily! A very strong currency can make it impossible for local factories to compete with cheap imports.
6. Evaluating Exchange Rate Systems
Which system is better? There is no single answer—it depends on the country's goals.
Floating Systems
Advantages:
1. Automatic Adjustment: If you have a trade deficit, your currency naturally falls, making your exports cheaper and fixing the problem automatically.
2. Policy Freedom: The Central Bank can use interest rates to control inflation instead of worrying about the exchange rate.
Disadvantages:
1. Uncertainty: Businesses don't know what the rate will be in six months, making it hard to plan international trade.
Fixed Systems
Advantages:
1. Stability: Provides certainty for exporters and importers, encouraging trade.
2. Discipline: Forces the government to keep inflation low to remain competitive.
Disadvantages:
1. Loss of Control: The Central Bank might be forced to raise interest rates to protect the currency even if the economy is in a recession.
2. Need for Reserves: You need huge amounts of foreign currency to defend the rate.
Key Takeaway: Floating = Flexibility. Fixed = Stability.
Final Quick Review Box
- Exchange Rate: The price of one currency in terms of another.
- Appreciation: Value goes up. (SPICED: Imports cheap, Exports dear).
- Depreciation: Value goes down. (WPIDEC: Imports dear, Exports cheap).
- Floating: Market forces (S&D) decide the rate.
- Fixed: Government/Central Bank decides the rate.
- Hot Money: Capital that moves quickly between countries to find the highest interest rates.