Strategic Financial Management · Foreign Exchange Market

Exchange Rate Determination and Regimes for CMA Final

Updated 11 October 2026 · Fact-checked

An exchange rate is the price of one currency in terms of another. It is set by demand and supply for the currency, driven by inflation, interest rates, trade and capital flows, and central bank action. A regime decides how much the central bank lets the market set it: fixed, floating or managed. To solve questions, identify the pressure on demand and supply, then state the direction of change.

Understand Exchange Rate Determination and Regimes

An exchange rate is the price of a foreign currency in your own currency. If USD 1 = ₹84, you pay ₹84 for one dollar. Like any price, it moves when demand and supply move.

Demand for dollars in India comes from importers, students paying fees abroad, Indian firms repaying foreign loans and investors sending money out. Supply of dollars comes from exporters, IT services earnings, remittances and foreign investors bringing money in. If demand for dollars exceeds supply, the rupee depreciates. If supply exceeds demand, the rupee appreciates.

Factors behind these flows:
- Inflation: higher inflation than trading partners makes your goods costlier and tends to weaken the currency over time.
- Interest rates: higher returns attract foreign capital and tend to strengthen the currency, other things equal.
- Current account: a deficit means more demand for foreign currency.
- Capital flows: FDI and FPI inflows raise supply of foreign currency.
- Growth, political stability and expectations: these shift capital flows and sentiment.
- Central bank action: buying or selling foreign currency changes supply directly.

The balance of payments (BoP) records all such flows. Current account plus capital account plus changes in reserves must balance in accounting terms. A deficit on current and capital accounts together must be financed by drawing down reserves or the currency must fall. So the BoP is the link between real flows and the exchange rate.

A regime is the rule the authorities follow. In a fixed system the central bank commits to a rate and uses reserves and policy to defend it. In a floating system the market sets the rate and the central bank does not target a level. In between are managed float and pegs with bands. India's RBI describes its approach as a market-determined rate, with intervention to curb excessive volatility and not to defend a particular level. India is classified as managed floating in practice.

The nominal exchange rate is the quoted market rate. The real exchange rate adjusts it for price levels, so it shows competitiveness. The nominal effective exchange rate (NEER) is a weighted average of the rupee against a basket of currencies. The real effective exchange rate (REER) is the NEER adjusted for relative inflation. In the RBI's published indices, which are in foreign currency per rupee, a rising REER means real appreciation of the rupee and lower competitiveness of Indian goods. Always check the quote convention before you read the direction.

Key rules to remember

Percentage change in a currency: % change in foreign currency = (New rate − Old rate) ÷ Old rate × 100; Rate is in direct quote (₹ per unit of foreign currency). A positive value is the foreign currency's rise in rupee terms, which means the rupee has depreciated.
Real exchange rate (direct quote): Real rate = Nominal rate × (Foreign price level ÷ Domestic price level); Quote convention: direct quote, ₹ per unit of foreign currency. A rise in this real rate means Indian goods have become cheaper relative to foreign goods, so competitiveness has improved. Use consistent price indices. This is not the RBI's REER convention. The sign of a rise is opposite in the two.
NEER: NEER = weighted average of bilateral exchange rate indices, weights = trade shares; No inflation adjustment. Index form, base year = 100.
REER: REER = Π (e_i × P_domestic ÷ P_foreign,i)^wi; Quote convention: e_i is the indirect quote (foreign currency i per ₹), expressed as an index to the base year. Weights wi are trade shares and add up to 1. This is the form used in the RBI's published indices. A rise in REER means real appreciation of the rupee and reduced competitiveness. A fall means real depreciation and improved competitiveness. Keep this separate from the direct-quote real rate above: there a rise means improved competitiveness, here a rise means reduced competitiveness. Always check the quote convention first.
BoP identity: Current account + Capital and financial account + Change in reserves (with errors and omissions) = 0; Reserves fall when the first two together are in deficit.

How to solve Exchange Rate Determination and Regimes questions

Use this sequence for descriptive, case-based and numerical questions on rate determination and regimes.

1Fix the quote. Note whether the rate is direct (₹ per foreign unit) or indirect, and which currency is the base.
2List the events in the question: inflation gap, interest gap, trade or capital flow, policy action.
3For each event, state whether it raises demand for foreign currency or supply of it.
4Conclude the direction: rupee depreciates if demand for foreign currency rises, appreciates if supply rises.
5Check the regime. Under floating, the rate adjusts. Under fixed or managed, the central bank absorbs the pressure through reserves or policy.
6Link to the BoP: identify the account affected and whether reserves rise or fall.
7For numbers, compute the percentage change with the correct base and say depreciation or appreciation.
8Close with a one-line recommendation or implication for the firm, such as hedging exposure.

Quickest way: Demand-supply arrow method

When to use it: Use for MCQs and short case questions asking which way the rate moves.

Write USD demand or USD supply next to each event.
Importers, outflows, debt repayment: more demand for USD, ₹ weaker.
Exports, inflows, remittances, RBI selling USD: more supply of USD, ₹ stronger.
Higher domestic inflation, other things equal: ₹ weaker over time.
Higher domestic interest rate, other things equal: ₹ stronger.
Net the arrows, then check the regime for who absorbs the move.

Common mistakes in Exchange Rate Determination and Regimes

Saying a higher interest rate always strengthens the currency.
Students learn the rule without the condition.
Fix: Add 'other things equal'. If the rate rise signals a crisis or inflation is higher, the effect can reverse.
Mixing up depreciation and appreciation with direct quotes.
A higher number looks like a stronger rupee.
Fix: In ₹ per USD, a higher number means more rupees per dollar, so the rupee has depreciated.
Calling India a free float or a fixed peg.
Textbooks present the two extremes only.
Fix: State that the rate is market-determined and the RBI intervenes to curb excess volatility, so it is a managed float.
Treating NEER and REER as the same.
Both are basket indices.
Fix: NEER ignores price differences. REER adjusts for relative inflation and measures competitiveness.
Ignoring reserves when discussing intervention.
Focus stays on the rate alone.
Fix: When RBI sells dollars to support the rupee, reserves fall and BoP shows the financing. Mention both.
Computing percentage change on the wrong base.
Students divide by the new rate.
Fix: Always divide the change by the old rate for the currency whose change you are reporting.

Worked examples

Example 1

The rupee moves from ₹83.00 per USD to ₹84.66 per USD. Calculate the percentage change in the USD in rupee terms, the percentage change in the rupee in dollar terms, and state whether the rupee has appreciated or depreciated.

Show the solution

Change in rate = 84.66 − 83.00 = ₹1.66.
Percentage change in USD (in rupee terms) = 1.66 ÷ 83.00 × 100 = 2.00%. The USD has appreciated by 2.00%.
The dollar costs more rupees, so the rupee has weakened.
Rupee's own change in dollar terms: old value of ₹1 = 1/83 = $0.012048; new value = 1/84.66 = $0.011812; change = (0.011812 − 0.012048) ÷ 0.012048 × 100 = −1.96%.
Tie to the sign rule: the +2.00% is the USD's change, not the rupee's. The rupee's own change is −1.96%, which is a depreciation.

Answer: The USD has appreciated by 2.00% in rupee terms. The rupee has depreciated by about 1.96% in dollar terms (1/83 to 1/84.66). Do not report +2.00% as the rupee's change.

Exam tips

In MCQs, read the quote carefully before deciding appreciation or depreciation.
For theory questions, write a short table-like comparison in bullets: who sets the rate, role of reserves, adjustment mechanism, merits and demerits of fixed vs floating.
Always connect to India: market-determined rate and RBI intervention to curb volatility.
In case questions, end with the impact on the firm, such as higher import cost or hedging need.
Define NEER and REER in one line each, then state what a rising REER signals: in the RBI's foreign-currency-per-rupee indices, real appreciation of the rupee and lower competitiveness.

Practice questions from Foreign Exchange Market

Exchange Rate Determination and 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 Determination and Regimes: frequently asked questions

What is the difference between fixed and floating exchange rates?

In a fixed system the central bank commits to a rate and defends it using reserves and policy. In a floating system supply and demand set the rate. Fixed gives certainty but needs large reserves. Floating adjusts automatically but can be volatile.

Which exchange rate regime does India follow?

India's rupee is market-determined, and the RBI intervenes in the market to curb excessive volatility, not to defend a fixed level. In practice this is described as a managed float.

How is the balance of payments linked to the exchange rate?

The BoP records the flows that create demand and supply of foreign currency. A net deficit on current and capital accounts puts downward pressure on the rupee unless reserves are used to finance it.

What is the difference between nominal and real effective exchange rate?

The nominal effective rate is a trade-weighted average of the rupee against several currencies. The real effective rate also adjusts for inflation differences, so it shows changes in competitiveness.