Appreciation, Depreciation, Devaluation and Revaluation Explained

Yesterday, one dollar cost Rs 80. Today, it costs Rs 88.

The number has gone up. Has the rupee become stronger?

No. You now need eight extra rupees to buy the same dollar. The dollar has become more expensive, and the rupee buys less foreign currency.

This is where many exchange-rate answers go wrong. Students remember that appreciation means an increase, spot a rising number, and attach the right definition to the wrong currency.

Let’s make the four terms clear, then follow the change through an import bill, an export order, and the balance of payments. Every exchange rate and business example below is hypothetical, chosen for easy calculation. They are not current market quotes.

The four terms at a glance

Two questions decide the correct term:

1. Has the domestic currency gained or lost value against the foreign currency?
2. Is this a market movement under a floating system, or an official change in a fixed exchange rate?

Change in domestic currency value	Market movement under a floating system	Official change in a fixed rate
Value rises	Appreciation	Revaluation
Value falls	Depreciation	Devaluation

Currency appreciation means an increase in the value of a currency relative to another currency under a floating exchange-rate system.

Currency depreciation means a decrease in that relative value under a floating system.

Devaluation is an official reduction in the value of the domestic currency under a fixed exchange-rate system.

Revaluation is an official increase in that value under a fixed system.

These distinctions follow the treatment of exchange-rate systems in NCERT’s Open Economy Macroeconomics chapter.

A large fall is not automatically devaluation. A small official reduction in a fixed currency value can be devaluation; a large market-driven fall can still be depreciation.

Read the quote before reading the movement

Throughout most of this guide, let:

e = rupees needed to buy one US dollar.

So e = 80 means USD 1 = Rs 80. This is the rupee price of the dollar.

Quote changes from	What one dollar now costs	What happened to the rupee?
Rs 80 to Rs 88 per dollar	More rupees	It weakened
Rs 80 to Rs 72 per dollar	Fewer rupees	It strengthened

With this quote, e rising means the rupee weakens; e falling means the rupee strengthens.

Now reverse the quote. At Rs 80 per dollar:

Value of one rupee = USD 1/80 = USD 0.0125.

At Rs 88 per dollar:

Value of one rupee = USD 1/88 = approximately USD 0.011364.

The dollar price rose, but the dollar value of one rupee fell. Both descriptions refer to the same event.

An exchange rate is a relative price. The rupee can strengthen against one currency while weakening against another. A statement about the rupee and dollar alone does not establish what happened against every trading partner. The Reserve Bank of Australia’s measurement explainer distinguishes these bilateral quotes from broader trade-weighted measures.

Four short situations: choose the right name

1. A market movement from Rs 80 to Rs 88 per dollar

The rupee buys fewer dollars. Under a floating system, this is rupee depreciation.

Against the rupee, the dollar has appreciated.

2. A market movement from Rs 80 to Rs 72 per dollar

One dollar costs fewer rupees. Under a floating system, this is rupee appreciation.

Against the rupee, the dollar has depreciated.

3. Authorities change a fixed rate from Rs 80 to Rs 88 per dollar

The official value of the rupee has been reduced. This is devaluation of the rupee.

The numerical rupees-per-dollar quote rises even though the domestic currency is devalued.

4. Authorities change a fixed rate from Rs 80 to Rs 72 per dollar

The official value of the rupee has been raised. This is revaluation of the rupee.

The direction of the price effects resembles appreciation. The reason for using a different term is the official resetting of a fixed rate.

Does central-bank intervention always mean devaluation?

No. In a managed float, the central bank may buy or sell foreign currency to influence market conditions. That intervention does not, by itself, amount to resetting an official fixed parity.

For an exam distinction, look for wording such as “officially reduced the fixed value”. Do not classify every policy-influenced market fall as devaluation.

Exchange-rate percentages: specify what changed

Suppose the quote moves from Rs 80 to Rs 88 per dollar.

The percentage rise in the rupee price of the dollar is:

[(88 - 80) / 80] x 100 = 10%.

However, the percentage fall in the dollar value of one rupee uses the reciprocal quote:

[(1/80 - 1/88) / (1/80)] x 100 = approximately 9.09%.

These percentages differ because they measure changes in reciprocal prices with different starting values.

A useful exact expression, when e rises from e0 to e1, is:

Percentage fall in the foreign-currency value of the domestic currency = [(e1 - e0) / e1] x 100.

When e falls from e0 to e1, the percentage rise in that value is:

[(e0 - e1) / e1] x 100.

For Rs 80 to Rs 72 per dollar, the quoted dollar price falls by 10%, while the dollar value of one rupee rises by approximately 11.11%.

A reverse calculation

Suppose the dollar value of the rupee falls by exactly 20%, starting from Rs 80 per dollar.

Initial value of one rupee = USD 0.0125.

New value = 0.0125 x 0.80 = USD 0.01.

Therefore, the new quote is Rs 100 per dollar, not Rs 96. The dollar’s rupee price has risen by 25%.

What happens to imports after depreciation?

Begin with a foreign price that stays unchanged.

An Indian shop imports a machine priced at USD 500. Ignore transport charges, taxes, bank fees, and currency hedging.

Item	At Rs 80 per dollar	At Rs 88 per dollar
Supplier’s dollar price	USD 500	USD 500
Rupee cost: dollar price x e	Rs 40,000	Rs 44,000

The machine costs Rs 4,000 more even though its dollar price has not changed.

This arithmetic supports the usual explanation:

Domestic currency weakens → foreign goods cost more in domestic currency → buyers may reduce import quantities or switch to domestic alternatives.

The word “may” matters. A hospital might still need an imported machine. A manufacturer may have no immediate substitute for an essential component.

Do not jump from “imports become expensive” to “import expenditure falls”. Expenditure equals price multiplied by quantity. A higher price can outweigh a smaller quantity.

Quantity falls, but the import bill rises

Suppose a business initially imports 100 components at USD 10 each.

At Rs 80 per dollar, the bill is:

100 x USD 10 x Rs 80 = Rs 80,000.

After depreciation to Rs 88 per dollar, it orders only 95 components:

95 x USD 10 x Rs 88 = Rs 83,600.

Import volume fell by 5%, yet the rupee bill rose by Rs 3,600, or 4.5%.

The company bought less and paid more. That is why an answer about import volume cannot automatically be used as an answer about import value.

What happens to exports after depreciation?

Now keep the exporter’s rupee selling price unchanged.

An Indian craft business sells a lamp for Rs 4,400.

At Rs 80 per dollar, the foreign buyer pays:

Rs 4,400 / 80 = USD 55.

At Rs 88 per dollar, the foreign buyer pays:

Rs 4,400 / 88 = USD 50.

The lamp becomes cheaper in dollars. Its lower foreign-currency price may attract more orders.

The standard chain is:

Domestic currency weakens → domestic goods become cheaper for foreign buyers, with domestic prices unchanged → export demand may rise → export volume can increase if producers can supply it.

What if the export contract is already in dollars?

Suppose a different exporter has an existing invoice for USD 2,000.

At Rs 80 per dollar, the receipt converts to Rs 1,60,000.

At Rs 88 per dollar, it converts to Rs 1,76,000.

The exporter receives Rs 16,000 more for the same dollar invoice. But the foreign buyer still pays USD 2,000. There has been no automatic reduction in that buyer’s price.

These are two different assumptions:

• Fixed rupee export price: the foreign-currency price falls after depreciation.
• Fixed dollar export price: rupee receipts rise after depreciation.

Do not use both benefits for the same unchanged sale without explaining how the price was set.

Does every exporter earn a higher profit?

No. Consider an exporter with a USD 2,000 receipt, a USD 1,000 imported-input bill, and other costs of Rs 60,000.

At Rs 80 per dollar:

Profit = Rs 1,60,000 - Rs 80,000 - Rs 60,000 = Rs 20,000.

At Rs 88 per dollar:

Profit = Rs 1,76,000 - Rs 88,000 - Rs 60,000 = Rs 28,000.

Profit rises by Rs 8,000, not by the full Rs 16,000 increase in export receipts. The imported input absorbs part of the gain.

This example holds quantities and all other costs constant. Actual results also depend on contracts, production capacity, and price changes.

Appreciation and revaluation: reverse the price direction

With appreciation, each rupee buys more foreign currency. With an official revaluation, the same strengthening occurs through a change in the fixed rate.

Suppose the quote falls from Rs 80 to Rs 72 per dollar:

• A USD 500 import falls from Rs 40,000 to Rs 36,000.
• A domestic product priced at Rs 3,600 rises from USD 45 to USD 50 for a foreign buyer.
• A USD 2,000 export receipt converts into Rs 1,44,000 instead of Rs 1,60,000.

The usual tendency is towards cheaper imports for domestic buyers and less competitive exports, holding the relevant seller-currency prices unchanged.

Calling appreciation “good” and depreciation “bad” misses the distribution of gains and costs. A family paying a fixed overseas tuition bill and an exporter receiving a fixed dollar payment can prefer opposite movements.

How does this affect the balance of payments?

Keep three ideas separate:

Merchandise trade balance = goods exports - goods imports.

Current account balance = goods and services balance + net primary income + net secondary income.

Balance of payments, or BOP, = the wider record of transactions between residents and non-residents, including financial transactions.

Primary income includes items such as investment interest. Secondary income includes transfers such as personal remittances. Borrowing from abroad is a financing transaction, not export earnings.

The IMF’s balance-of-payments overview identifies the goods, services, income, capital, and financial components. Its explanation of double-entry recording shows why the complete accounts balance in principle.

So what does “BOP deficit” mean in a school question?

It commonly refers to a shortfall in autonomous receipts relative to autonomous payments, requiring accommodating finance such as a reserve drawdown. It does not mean that the complete double-entry statement permanently has unmatched entries.

Depreciation or devaluation may help reduce an external deficit through trade, if export receipts increase and import payments respond favourably. It does not guarantee an improvement in every part of the BOP.

One current-account calculation

Suppose an economy has the following annual amounts, all measured in the same currency and in millions:

Component	Initial position	Later position
Goods exports	500	560
Goods imports	650	640
Goods trade balance	-150	-80
Net services	+60	+60
Net primary income	-30	-45
Net secondary income	+40	+40
Current account balance	-80	-25

Initially:

-150 + 60 - 30 + 40 = -80.

Later:

-80 + 60 - 45 + 40 = -25.

The goods trade deficit narrows by 70, but the current-account deficit narrows by only 55 because the net primary-income outflow becomes larger.

These are assumed outcomes, not numbers that can be predicted from the exchange rate alone. They show why “trade balance improves” and “current account improves by the same amount” are different claims.

Why the trade balance may worsen before improving

Prices can change before buying habits and production do.

A manufacturer may be committed to an import contract. Foreign buyers may need months to find new suppliers. Exporters may need equipment and workers before they can fulfil extra orders.

This can produce the J-curve effect: following depreciation or devaluation, the trade balance initially worsens and later improves as quantities adjust. It is a possible pattern, not a promise. The Reserve Bank of Australia’s exchange-rate explainer describes this difference between immediate price effects and slower volume effects.

A numerical J-curve illustration

Assume one export product and one import product. The export price remains Rs 800 per unit; the import price remains USD 10 per unit. Initially, the rate is Rs 80 per dollar and the economy trades 100 units of each.

Stage	Export receipts in rupees	Import payments in rupees	Trade balance in rupees
Before depreciation	100 x 800 = 80,000	100 x 10 x 80 = 80,000	0
Immediately after rate rises to 88	100 x 800 = 80,000	100 x 10 x 88 = 88,000	-8,000
Later: exports 120 units, imports 90	120 x 800 = 96,000	90 x 10 x 88 = 79,200	+16,800

Initially, unchanged quantities and a higher import price create a deficit. Later, the assumed quantity responses generate a surplus.

All values within this table use rupees. Comparing export receipts in rupees with import payments in dollars would produce a meaningless balance.

What determines whether the later improvement happens?

Ask whether foreign buyers respond to lower export prices, whether domestic buyers can replace imports, and whether producers can expand output.

For students studying elasticity conditions, the conventional Marshall-Lerner condition says that, starting from balanced trade under the standard simplifying assumptions, depreciation improves the trade balance if the sum of the absolute price elasticities of export demand and import demand exceeds one. Those assumptions include full exchange-rate pass-through and sufficiently responsive supply.

For example, elasticities of 0.7 and 0.6 sum to 1.3, which satisfies the condition. Elasticities of 0.2 and 0.4 sum to 0.6, which does not. A sum of one is the boundary case in this simplified local analysis.

The IMF’s discussion of external adjustment explains why incomplete price pass-through and slow quantity adjustment complicate this result. Use the condition when your course or question calls for it; do not present it as an unconditional rule for every economy.

Two other effects worth remembering

Imported inflation: depreciation can raise the domestic cost of imported fuel, materials, and finished goods. How much reaches consumers depends partly on whether firms change prices or absorb costs in their margins.

Foreign-currency obligations: a borrower owing USD 10,000 needs Rs 8,00,000 at Rs 80 per dollar and Rs 8,80,000 at Rs 88 per dollar. This example assumes an unhedged dollar obligation. A liability fixed in rupees does not mechanically grow in rupee terms because the exchange rate changes.

Also separate a higher translated value of an existing foreign liability from a new BOP transaction. A valuation change alone is not a fresh borrowing or payment. The IMF’s accounting framework records such valuation changes separately from transactions.

How to organise a clear exam answer

For a question asking how depreciation affects imports, exports, and external balance, use this sequence:

1. Identify the quote: the domestic currency buys less foreign currency.
2. Explain import prices: a given foreign-currency price becomes more expensive in domestic currency.
3. Explain export prices: a given domestic-currency price becomes cheaper in foreign currency.
4. Connect prices to quantities: import demand tends to fall and export demand tends to rise, other things equal.
5. Qualify the balance effect: the outcome depends on quantity responses, invoice prices, and adjustment time.

A compact answer could read:

“Depreciation reduces the foreign-currency value of the domestic currency. With relevant seller-currency prices unchanged, imports become costlier for domestic buyers and exports become cheaper for foreign buyers. This tends to reduce import volume and increase export volume. It may improve the trade balance, but the result depends on demand responsiveness and the time available for adjustment.”

For devaluation, begin by identifying the official reduction in a fixed currency value. The basic price channels then follow the same logic.

Try these before looking at the answers

Practice questions

1. A floating quote changes from Rs 75 to Rs 90 per dollar. Name the movement of the rupee and calculate the percentage rise in the dollar’s rupee price.
2. In Question 1, calculate the percentage fall in the dollar value of one rupee.
3. A fixed quote is officially changed from Rs 90 to Rs 81 per dollar. Name the change in the domestic currency.
4. An imported book costs USD 25. Calculate its rupee price at Rs 80 and Rs 84 per dollar, ignoring other charges.
5. An exporter keeps a product’s rupee price at Rs 6,300. Find the dollar price at Rs 84 and Rs 90 per dollar.
6. Imports fall from 200 to 190 units. Each costs USD 5, and the quote rises from Rs 80 to Rs 88 per dollar. Does the rupee import bill fall?
7. Goods exports are 900, goods imports 1,100, net services +120, net primary income -50, and net secondary income +80. Calculate the current account balance.
8. “The central bank bought dollars, so the rupee was devalued.” What information is missing?

Answers and reasoning

1. Rupee depreciation. The dollar price rises by (15 / 75) x 100 = 20%.
2. The rupee’s dollar value falls by (15 / 90) x 100 = approximately 16.67%.
3. Revaluation. The official fixed value of the domestic currency rises because fewer rupees buy one dollar.
4. Rs 2,000 and Rs 2,100. Multiply the dollar price by the rupees-per-dollar quote.
5. USD 75 and USD 70. Divide the fixed rupee price by the quote. The foreign buyer faces a lower price after the rupee weakens.
6. No. The initial bill is 200 x 5 x 80 = Rs 80,000. The later bill is 190 x 5 x 88 = Rs 83,600.
7. -50, in the same units as the question: 900 - 1,100 + 120 - 50 + 80.
8. You need to know whether authorities officially reduced a fixed parity. Buying dollars in a managed floating system does not by itself establish devaluation.

Frequently asked questions

1. What is the difference between depreciation and devaluation?

Both mean a lower domestic-currency value relative to foreign currency. Depreciation describes a fall under a floating system. Devaluation is an official reduction in the currency’s fixed value.

2. What is the difference between appreciation and revaluation?

Both mean a higher domestic-currency value. Appreciation occurs under a floating system; revaluation is an official increase in a fixed value.

3. Why does a rising rupees-per-dollar quote mean rupee depreciation?

Because the same dollar now costs more rupees. Each rupee buys a smaller fraction of a dollar. Always read the units before interpreting the direction.

4. Does depreciation always increase exports?

No. It can make exports more competitive, depending on invoice prices, but buyers must respond and producers must be able to supply more. Export volume, foreign-currency receipts, and domestic-currency receipts need not change by the same percentage.

5. Does depreciation make imports cheaper?

For a domestic buyer, a fixed foreign-currency import price becomes more expensive after depreciation. Appreciation has the opposite conversion effect. Actual retail prices may respond later or only partly.

6. Is a stronger currency always better for an economy?

No. It helps purchasers of foreign currency, including importers with fixed foreign-currency bills, but can reduce export competitiveness and domestic-currency export receipts. The overall effect depends on the economy’s trade, costs, and obligations.

7. Can import expenditure rise even when import quantity falls?

Yes. If the domestic-currency price rises enough, the higher price outweighs the lower quantity. Calculate price multiplied by quantity in a common currency before concluding what happened to expenditure.

8. Does devaluation automatically correct a BOP deficit?

No. It may improve trade competitiveness, but the outcome depends on demand elasticities, supply capacity, contracts, imported-input costs, and other international flows. The initial trade-balance effect may even be adverse.

9. What is the J-curve effect?

It is a possible pattern in which the trade balance worsens shortly after depreciation or devaluation and improves later. Prices adjust before export and import quantities have fully responded.

10. Does a 10% rise in rupees per dollar mean the rupee loses exactly 10% of its dollar value?

No. A move from Rs 80 to Rs 88 is a 10% rise in the dollar’s rupee price, but the reciprocal value of one rupee falls by approximately 9.09%. State which quote and starting value your percentage uses.