Business Economics · Balance of payments and exchange rates

Exchange Rate Regimes: Fixed, Floating and Managed Float

Updated 11 October 2026 · Fact-checked

An exchange rate regime is the rule a country follows to set its currency's value. In a fixed regime the central bank defends a set rate. In a floating regime the market sets it. In a managed float the market sets it, but the central bank intervenes using reserves and interest rates.

Understand Exchange Rate Regimes

An exchange rate is the price of one currency in terms of another. A regime is the system a country uses to decide how that price is set. Three types matter for CB2: fixed, floating and managed.

In a fixed regime (also called a pegged regime), the government or central bank commits to a set rate against another currency or a basket. To hold the rate, it must buy or sell currency in the market. If the currency is weak, it sells foreign reserves and buys its own currency. If the currency is strong, it sells its own currency and builds reserves. A devaluation is an official cut in the peg. A revaluation is an official rise.

In a floating regime, demand and supply for the currency set the rate with no official target. A fall in value is a depreciation. A rise is an appreciation. The central bank does not need large reserves for defence, and it can set interest rates for domestic goals such as inflation and growth. The cost is that the rate can swing, which creates uncertainty for traders and firms.

A managed float (dirty float) sits between the two. The rate moves with the market, but the central bank steps in to smooth sharp moves or to resist a trend it sees as harmful. Many emerging economies, including India, are usually described as using a managed float. Some regimes also use a band, where the rate may move within limits and the bank acts at the edges.

Central bank intervention has two main forms. Direct intervention is buying or selling foreign currency using reserves. Indirect intervention is changing interest rates, or using controls on capital flows, to alter demand for the currency. Foreign exchange reserves are the stock of foreign assets the bank holds for this purpose. Sterilised intervention offsets the effect on the domestic money supply. Unsterilised intervention lets the money supply change.

Key rules to remember

Exchange rate quote: Domestic price of foreign currency = ₹ per 1 unit of foreign currency; A rise in ₹ per US$ means the rupee has depreciated. Always state which currency is the base.
Percentage change in a currency: % change in foreign currency's value = (new rate − old rate) ÷ old rate × 100; Rate is quoted as ₹ per unit of foreign currency. A positive result means the foreign currency has appreciated and the rupee has depreciated.
Defence of a peg: weak currency: Central bank sells foreign reserves, buys domestic currency, and may raise interest rates; Reserves fall. This cannot go on if reserves run out.
Defence of a peg: strong currency: Central bank sells domestic currency, buys foreign currency, and may cut interest rates; Reserves rise. Unsterilised sales can raise the money supply and inflation.
Reserves cover: Import cover (months) = foreign exchange reserves ÷ average monthly imports; A common reserve adequacy measure. Higher cover gives more room to defend the currency.

How to solve Exchange Rate Regimes questions

Use this method for any question on regimes, intervention or reserves.

1Identify the regime in the question: fixed, floating, managed or banded. Name it in your first line.
2Define the exchange rate quote. Say which currency is the base, and what a rise in the number means.
3Find the pressure on the currency: excess demand or excess supply at the current rate. Draw a quick demand and supply diagram if the question allows.
4State the result under that regime. Fixed: the bank must act and reserves change. Floating: the rate adjusts. Managed: the bank acts to smooth the move.
5Name the tool the bank uses: buying or selling currency, changing interest rates, or capital controls. Say whether it is sterilised.
6Work out the effects on trade, inflation, interest rates and reserves, in that order.
7For compare or evaluate questions, give both advantages and disadvantages, then a judgement that depends on the country's reserves, inflation and openness.
8Check the direction of every move before you write the final answer.

Quickest way: Pressure, response, consequence

When to use it: Use it for short written answers and MCQs when time is tight.

Pressure: is the currency under downward or upward pressure at the current rate?
Response: fixed means reserves move; floating means the rate moves; managed means both can move a little.
Consequence: link the response to exports, import prices, inflation and reserves.
For MCQs, eliminate any option that says a floating rate needs the bank to defend a target, or that a peg lets the bank set interest rates freely.

Common mistakes in Exchange Rate Regimes

Confusing devaluation with depreciation.
Both mean the currency is worth less, so the words feel the same.
Fix: Devaluation is an official decision under a fixed regime. Depreciation is a market-driven fall under a floating regime.
Reading the quote the wrong way round.
Students see a higher number and assume the rupee is stronger.
Fix: If the quote is ₹ per US$, a higher number means the rupee has weakened. Write the quote down before you reason.
Saying a fixed rate gives the central bank full control of everything.
The word fixed suggests certainty.
Fix: Defending the peg uses up independence in interest rates and needs enough reserves. State this trade-off.
Ignoring reserves when discussing a fixed or managed regime.
Students focus on the rate and forget how it is held.
Fix: Always say which way reserves move and what happens if they run low.
Listing advantages and disadvantages without a judgement.
Students treat the question as a recall task.
Fix: Close with a view that depends on conditions such as inflation record, reserves and trade openness.
Treating a managed float as simply a fixed rate.
Intervention sounds like a peg.
Fix: A managed float has no announced target. The bank smooths moves but lets the market drive the trend.

Worked examples

Example 1

A country pegs its currency at ₹80 per 1 unit of a foreign currency. Market pressure pushes the equilibrium to ₹84. Explain what the central bank must do to keep the peg and what happens to reserves. Also find the percentage the foreign currency would rise if the peg were abandoned and the rate moved to ₹84.

Show the solution

The regime is fixed. The peg is ₹80 per unit of foreign currency.
At ₹80 the market wants more foreign currency than is on offer, since the equilibrium rate is higher at ₹84. The rupee is under downward pressure.
To hold the peg, the bank sells foreign currency from reserves and buys rupees. This closes the gap between demand and supply at ₹80.
Reserves of foreign currency fall. The bank can also raise interest rates to attract capital and lift demand for the rupee.
Percentage change = (84 − 80) ÷ 80 × 100 = 4 ÷ 80 × 100 = 5%.
Interpretation: the foreign currency would appreciate by 5% and the rupee would depreciate. Note that the rupee falls by less than 5% in its own terms, since the rupee value of ₹1 would move from 1/80 to 1/84 of a unit.

Answer: The bank must sell foreign currency and buy rupees, so reserves fall, and it may raise interest rates. If the peg ended, the foreign currency would rise by 5% against the rupee.

Example 2

Compare a floating and a managed float exchange rate regime for an emerging economy that imports oil, and evaluate which is better.

Show the solution

Define each. Floating: the market sets the rate with no official target. Managed float: the market sets the rate, but the central bank intervenes to smooth moves.
Floating advantages: no need to hold large reserves for defence; interest rates can target domestic inflation and growth; the rate adjusts to correct trade imbalances.
Floating disadvantages: volatile rates raise uncertainty for importers and exporters; a sharp fall raises import prices, including oil, and can push up inflation.
Managed float advantages: smooths extreme moves, reducing hedging costs and imported inflation; reserves give a buffer in a shock.
Managed float disadvantages: needs reserves, which have an opportunity cost; markets may test the bank's resolve; intervention can distort signals if used to resist a long-term trend.
Judgement: for an oil importer with a history of imported inflation, a managed float is usually more suitable, provided reserves are adequate and the bank does not defend an unsustainable level.

Answer: A managed float is usually better for an oil-importing emerging economy with adequate reserves, since it limits volatile import costs while still letting the rate adjust. A pure float suits a country with strong institutions and low reliance on imported inflation.

Exam tips

Define the regime and the quote direction in the first two lines. Many marks go to clear definitions.
For evaluate questions, always finish with a judgement that depends on conditions such as reserves, inflation and openness.
In MCQs, watch for traps that swap depreciation with devaluation, or that reverse the direction of reserves under a weak currency.
Link intervention to reserves and interest rates every time. Examiners reward the full chain of cause and effect.
Use Indian examples, such as the rupee's managed float, only for context. Do not state exact figures unless the question gives them.

Practice questions from Balance of payments and exchange rates

Exchange Rate Regimes in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Exchange Rate Regimes: frequently asked questions

What is the difference between a fixed and a floating exchange rate?

In a fixed regime the central bank commits to a set rate and uses reserves and interest rates to hold it. In a floating regime the market sets the rate through demand and supply. A fixed rate gives stability but costs reserves and policy freedom. A floating rate gives freedom but can be volatile.

What are the advantages and disadvantages of a managed float?

A managed float smooths sharp moves and lets the rate adjust over time. It needs reserves and can be tested by markets. Its main weakness is that the bank's aims may be unclear, which can cause uncertainty.

How do central banks intervene in currency markets?

They buy or sell foreign currency from reserves, which is direct intervention. They also change interest rates or use capital controls, which is indirect intervention. Intervention can be sterilised to avoid changing the domestic money supply.

Is this topic tested in the CB2 exam?

Exchange rates and the balance of payments sit within macroeconomics in CB2, which is a large part of the syllabus. Expect it in both MCQs and written questions asking you to compare or evaluate.