How Exchange Rates Appreciate and Depreciate: Impacts on the Economy

Every morning, financial news bulletins in India report one number without fail: the rupee-dollar exchange rate. A one-rupee swing might look trivial, but it changes the price of your imported phone, the profit margin of an IT exporter, and even the interest the government pays on foreign loans. This constant movement between currencies is what economists call appreciation and depreciation, and understanding it is central to understanding a country’s Balance of Payments.

What appreciation and depreciation actually mean 🔗

Appreciation is a rise in the value of one currency relative to another, so it takes fewer units of that currency to buy a foreign currency. Depreciation is the opposite: a fall in value, meaning more units of the domestic currency are needed to buy the same amount of a foreign currency.

A quick rupee-dollar example 🔗

Suppose the exchange rate moves from ₹84 per US dollar to ₹90 per US dollar. You now need more rupees to buy one dollar, so the rupee has depreciated and the dollar has appreciated against it. If the rate instead moves from ₹90 to ₹84, the rupee has appreciated because it now buys more dollars than before.

India’s managed floating system 🔗

India does not fix the rupee’s value against any currency. Instead, the exchange rate is largely determined by demand and supply in the foreign exchange market, with the Reserve Bank of India stepping in periodically to prevent excessive volatility rather than to defend a fixed target. This arrangement, known as a managed float, has been in place since 1993, after India moved away from a pegged and then a dual exchange rate system.

What drives these currency movements 🔗

Appreciation and depreciation are not random. They respond to a set of measurable forces:

• Trade flows: A country that imports more than it exports needs more foreign currency to pay for those imports, which increases demand for that currency and puts downward pressure on the domestic currency.
• Capital flows: Foreign investment inflows into Indian stocks, bonds, or companies increase demand for rupees, supporting appreciation. Large outflows do the reverse.
• Interest rates: Higher domestic interest rates tend to attract foreign capital seeking better returns, which can strengthen the currency.
• Inflation differentials: If prices rise faster in India than in trading-partner countries, Indian goods become relatively expensive, which can weaken the rupee over time.
• Global risk sentiment: A stronger US dollar globally, oil price spikes, or geopolitical uncertainty often push investors toward safe-haven assets, pulling capital out of emerging markets like India.

How an appreciating currency affects the economy 🔗

When the rupee appreciates, it directly changes the relative cost of foreign and domestic goods.

Imports get cheaper 🔗

A stronger rupee means Indian importers pay less in rupee terms for the same quantity of crude oil, electronics, or machinery. This helps ease imported inflation, since a large share of India’s inflation basket is linked to global commodity prices.

Exports become costlier for foreign buyers 🔗

The flip side is that Indian goods and services become more expensive for overseas customers. An IT company billing clients in dollars, or a textile exporter selling in euros, effectively earns fewer rupees for every unit sold, and buyers abroad may look for cheaper alternatives from competing countries.

Effect on the trade surplus 🔗

If exports slow down while imports pick up, a trade surplus can shrink, or a modest deficit can widen. This is one reason central banks sometimes intervene when a currency appreciates too sharply.

How a depreciating currency affects the economy 🔗

Depreciation works in the opposite direction and carries its own trade-offs.

Exports become more competitive 🔗

When the rupee weakens, Indian goods and services become cheaper for foreign buyers without exporters having to cut their rupee-denominated prices. This can boost export volumes, particularly in price-sensitive sectors like textiles, gems and jewellery, and IT services.

Imports become expensive 🔗

The same weak rupee means paying more for crude oil, edible oils, electronics, and fertiliser imports, all of which India relies on heavily. This can push up domestic prices and squeeze the budgets of businesses and consumers alike.

Effect on the trade deficit and beyond 🔗

In theory, cheaper exports and costlier imports should help shrink a trade deficit. In practice, depreciation also raises the rupee cost of repaying foreign currency loans, can make foreign education and travel more expensive for Indian students and tourists, and may add to inflationary pressure that the RBI then has to manage through monetary policy.

Does depreciation automatically fix a trade deficit? 🔗

Not always, and this is where many textbook explanations oversimplify the picture. Two conditions decide whether depreciation actually improves the trade balance.

The Marshall-Lerner condition 🔗

For depreciation to improve the trade balance, the combined price responsiveness of export and import demand needs to be strong enough. Economists refer to this threshold as the Marshall-Lerner condition, which requires the sum of export and import demand elasticities to exceed one. If buyers and sellers are slow to change their behaviour when prices shift, a weaker currency alone will not meaningfully change trade volumes.

The J-curve effect 🔗

Even when the Marshall-Lerner condition eventually holds, the trade balance often worsens before it improves. Existing import and export contracts are typically signed at old prices and quantities, so in the short run the country simply pays more for the same volume of imports. Only as new contracts are negotiated and buyers adjust their purchasing patterns does the trade balance start to recover, tracing a pattern researchers call the J-curve, because the trade balance dips before it rises. For India, this means a weaker rupee will not instantly narrow the current account deficit; the benefit shows up with a lag, if it shows up at all.

Nominal versus real exchange rates 🔗

Newspaper headlines usually quote the nominal exchange rate, the straightforward rupee-per-dollar number. Policymakers, however, watch a more refined measure.

NEER and REER 🔗

The Nominal Effective Exchange Rate (NEER) tracks the rupee against a weighted basket of trading-partner currencies rather than just the dollar. The Real Effective Exchange Rate (REER) goes a step further by adjusting the NEER for inflation differences between India and its trading partners. The RBI publishes these indices regularly to gauge whether the rupee is overvalued or undervalued relative to its trading partners, since a currency that looks stable against the dollar alone might still be losing competitiveness against a broader set of trading partners once inflation is factored in.

Why this distinction matters for policy 🔗

A rising REER, even if the nominal rupee-dollar rate looks stable, can mean Indian exports are quietly becoming less price-competitive because domestic inflation is outpacing that of trading partners. This is exactly the kind of trend the government tracks through its annual Economic Survey, which compares the rupee’s performance against other emerging market currencies and links exchange rate movements to capital flows, crude prices, and the strength of the US dollar index.

The RBI’s balancing act 🔗

Because both extremes create problems, the RBI does not try to fix the rupee at a particular level. Its stated goal is to curb excessive volatility rather than to defend any specific rate. It buys dollars when the rupee appreciates too fast, protecting exporters, and sells dollars from its foreign exchange reserves when the rupee depreciates too sharply, cushioning importers and controlling imported inflation. This is why the rupee, like most managed floating currencies, moves within a broad range shaped by market forces but rarely without the RBI watching closely in the background.

Why students of Indian economy should care 🔗

Exchange rate movements sit at the intersection of trade policy, inflation management, and capital flows, which is exactly why the topic appears under Balance of Payments in most commerce curricula. A change of a few rupees per dollar can shift corporate earnings, government borrowing costs, household budgets, and India’s competitiveness in global markets, often simultaneously and in different directions. Reading exchange rate news with this framework in mind turns a confusing daily number into a meaningful economic signal.

What do you think? If a sharp rupee depreciation makes Indian exports cheaper but also raises the cost of crude oil imports and foreign debt repayments, how should policymakers decide whether the depreciation is, on balance, good or bad for the economy? And given the J-curve effect, would you expect Indian exporters to benefit immediately from a weaker rupee, or only after a delay?

References

1. https://website.rbi.org.in/web/rbi/foreign-exchange-management
2. https://www.tutor2u.net/economics/reference/currency-depreciation-and-the-trade-balance-chain-of-reasoning
3. https://www.sciencedirect.com/science/article/abs/pii/S0261517719300147
4. https://www.rbi.org.in/Scripts/BS_ViewBulletin.aspx?Id=20020
5. https://www.business-standard.com/budget/news/rupee-performed-better-than-currencies-of-canada-korea-brazil-eco-survey-125013101501_1.html