Exchange rate systems
CIE A-Level EconomicsΒ· Unit 8.4Β· 20 min read
1. Fixed Exchange Rate Systemsβ β ββββ± 6 min
Fixed exchange rate system
A system where the government or central bank pegs the value of the domestic currency to another currency (usually the US dollar or euro) or gold, and maintains this set value through central bank intervention.
Example:
Hong Kong pegs the Hong Kong Dollar to the US Dollar at a fixed rate of HK$7.75 = US$1.
To maintain the fixed peg, the central bank must intervene in the foreign exchange market whenever there is excess demand or excess supply of the domestic currency. If the domestic currency is under downward pressure (excess supply), the central bank buys domestic currency using its foreign exchange reserves. If there is upward pressure, it sells domestic currency and builds up reserves.
A country has a fixed exchange rate pegged to the US dollar at $1 = 15 pesos. A fall in foreign demand for the country's exports leads to excess supply of pesos in the foreign exchange market. Explain how the central bank maintains the peg, and what happens to foreign reserves.
- 1
A fall in export demand reduces demand for pesos, as foreign buyers need fewer pesos to buy the country's exports. This creates excess supply of pesos at the current fixed rate. Without intervention, the peso would fall in value.
- 2
To maintain the peg, the central bank must absorb the excess supply of pesos by buying pesos using its US dollar foreign exchange reserves.
- 3
Outcome: The exchange rate stays at 15 pesos per US dollar, and the country's foreign exchange reserves decrease by the value of the pesos bought.
Advantages: Reduces exchange rate volatility and uncertainty for international trade and investment
Advantages: Prevents excessive currency speculation
Advantages: Helps control inflation by anchoring domestic prices to the anchor currency
Disadvantages: Requires large holdings of foreign exchange reserves to defend the peg
Disadvantages: Limits the central bank's ability to pursue independent monetary policy
Disadvantages: Risk of currency crises if the peg is seen as unsustainable, leading to speculative attacks
2. Floating Exchange Rate Systemsβ β ββββ± 6 min
Floating exchange rate system
A system where the exchange rate is determined entirely by the market forces of supply and demand for the currency, with no intervention from the government or central bank.
Example:
The US dollar, Euro, Japanese Yen and British Pound all operate under fully floating exchange rate systems.
Under a floating system, any imbalance in the balance of payments automatically adjusts through changes in the exchange rate, without any need for central bank action. For example, a current account deficit will lead to depreciation of the domestic currency, which makes exports cheaper and imports more expensive, automatically correcting the deficit over time.
A country with a fully floating exchange rate has a persistent current account deficit. Explain how the exchange rate adjusts automatically to eliminate this deficit.
- 1
A current account deficit means supply of domestic currency in the foreign exchange market is greater than demand, as the country buys more foreign currency for imports than it earns from exports.
- 2
Excess supply of domestic currency causes its value to fall (depreciate) relative to other currencies.
- 3
After depreciation, the price of the country's exports falls for foreign buyers, so export volume increases. The price of imports for domestic buyers rises, so import volume decreases.
- 4
This process continues until the current account deficit is eliminated, with supply of and demand for domestic currency balanced at the new lower exchange rate.
Advantages: Allows the central bank full independence to pursue domestic monetary policy goals
Advantages: No need for large holdings of foreign exchange reserves, which can be used for other purposes
Advantages: Automatically adjusts to external shocks like changes in global commodity prices
Disadvantages: Creates exchange rate volatility and uncertainty, which can discourage trade and investment
Disadvantages: Allows excessive speculation that can misalign the exchange rate from its long-run equilibrium
Disadvantages: Sharp depreciation can lead to imported inflation
3. Managed Floating Exchange Rate Systemsβ β β βββ± 8 min
Managed floating exchange rate
A hybrid system that combines elements of fixed and floating exchange rates. The exchange rate is mostly determined by market forces, but the central bank intervenes periodically to stabilise the currency and prevent excessive short-term volatility.
Example:
Most major currencies today, including the Chinese Renminbi, operate under some form of managed float.
Central banks in a managed float system usually do not target a specific fixed exchange rate, but will intervene to 'smooth out' large fluctuations that could harm the domestic economy. Intervention can take the form of buying or selling foreign currency, or changing interest rates to influence capital flows. Proponents argue this system combines the best of both fixed and floating systems: it retains automatic adjustment to shocks while preventing excessive volatility.
A country with a managed float experiences a sharp, sudden appreciation of its currency due to large inflows of speculative foreign capital. How can the central bank intervene to reduce this appreciation?
- 1
To stop the currency from appreciating too rapidly, the central bank sells domestic currency and buys foreign currency in the foreign exchange market.
- 2
This increases the supply of domestic currency and increases demand for foreign currency, pushing the value of the domestic currency back down to a more competitive level.
- 3
The central bank may also lower domestic interest rates to reduce inflows of foreign capital attracted by higher returns, which further reduces upward pressure on the currency.
4. Common Pitfalls
Wrong move:
Confusing devaluation (fixed system) with depreciation (floating system)
Why:
Devaluation is a deliberate policy action, while depreciation is a market-driven change, and they occur under different systems
Correct move:
Remember: Devaluation = deliberate policy change under fixed rates; Depreciation = market-led fall in value under floating rates
Wrong move:
Claiming that fixed exchange rates eliminate all exchange rate risk
Why:
Even under a fixed system, there is always risk that the central bank will be forced to devalue the peg during a crisis
Correct move:
Fixed rates reduce short-term volatility, but do not eliminate all long-term risk of currency adjustment
Wrong move:
Assuming floating exchange rates automatically eliminate balance of payments deficits immediately
Why:
Adjustment can take time, and may be slow if demand for exports and imports is inelastic, so deficits can persist
Correct move:
While floating rates have automatic adjustment, the J-curve effect means deficits may worsen in the short run before improving
Wrong move:
Claiming central bank intervention in managed floating is always effective
Why:
If the central bank has insufficient reserves or market pressure is very strong, intervention may fail
Correct move:
Intervention is most effective at smoothing short-term volatility, not fighting long-term market trends
5. Quick Reference Cheatsheet
Exchange Rate System | How it works | Key Pros | Key Cons |
|---|---|---|---|
Fixed (Pegged) | Centrally set to an anchor, maintained by intervention | Low volatility, controls inflation | Needs reserves, no independent monetary policy |
Fully Floating | Determined by market supply/demand, no intervention | Independent monetary policy, automatic adjustment | High volatility, uncertainty for trade |
Managed Float | Mostly market determined, occasional intervention | Combines flexibility and stability | Risk of mismanagement, manipulation claims |
6. Frequently Asked
What is the difference between devaluation and depreciation?
Devaluation is a deliberate downward adjustment of a fixed exchange rate by a central bank. Depreciation is a fall in the value of a currency under a floating system caused by market forces.
Is managed floating the same as a fixed system?
No. Managed floating allows currency values to fluctuate daily based on market supply and demand, but central banks intervene periodically to prevent excessive volatility, unlike fixed systems where the rate is permanently held at a set level.
When this came up on past exams
AI-estimated based on syllabus patterns β cross-check with official past papers for accuracy. Use only as revision-focus signals.
- 2022 Β· 22
Compare fixed vs floating exchange rate systems
- 2023 Β· 12
Discuss advantages of managed floating
- 2021 Β· 31
Evaluate fixed rates for developing countries
Going deeper
What's Next
Understanding exchange rate systems is a foundation for further analysis of how open economies respond to global shocks and the impacts of globalisation. Next, you will explore how different exchange rate systems affect macroeconomic policy outcomes, including the impact of exchange rate changes on inflation, unemployment, and the balance of payments. You will also learn about currency unions and the role of international institutions like the International Monetary Fund in managing global exchange rate arrangements. This topic is frequently tested in both multiple choice and essay questions in CIE 9708, so it is important to be able to compare and contrast the different systems and evaluate their suitability for different types of economies.