Depreciation

1. Meaning, measurement and related concepts

Currency depreciation means a decline in the value of a domestic currency relative to another currency in the foreign-exchange market. It concerns external purchasing power, unlike domestic inflation, which concerns purchasing power over goods and services within the economy. The two can influence each other but are not identical: a currency can depreciate without domestic prices rising by the same proportion.

Exchange-rate quotation is crucial. When the rate is expressed as rupees per US dollar, an increase indicates rupee depreciation. A movement from ₹80/$ to ₹84/$ means that buying one dollar now costs 5% more rupees. However, the rupee’s dollar value falls from $1/80 to $1/84, a depreciation of approximately 4.76%. The two percentages differ because their denominators differ.

Depreciation and appreciation normally describe market movements. Devaluation and revaluation describe official changes in a fixed or pegged parity. These distinctions concern the exchange-rate mechanism, not merely the size of the movement. Currency depreciation must also be distinguished from depreciation of physical capital, which means loss of an asset’s value through wear, ageing or obsolescence.

• With E defined as domestic currency per unit of foreign currency, a rise in E indicates domestic-currency depreciation.
• Currency-value depreciation percentage equals [1 − (old E/new E)] × 100.

2. Why a currency depreciates

The exchange rate reflects demand for and supply of foreign exchange. Import payments, overseas travel, outward investment and foreign-debt repayments create demand for foreign currency. Export receipts, inward remittances, foreign investment and external borrowing supply it. Other things equal, stronger demand for dollars or weaker dollar supply places depreciation pressure on the rupee.

A rise in international crude-oil prices can increase India’s import bill and dollar demand. A widening current-account deficit becomes a source of pressure when stable capital inflows are insufficient to finance it. Conversely, a current-account deficit does not mechanically imply depreciation: sufficiently large financial inflows can support or strengthen the currency.

Financial conditions can move exchange rates faster than trade flows. Higher US interest rates, changes in expected returns and global risk aversion may encourage investors to shift towards dollar assets. Foreign portfolio outflows can then weaken the rupee. Foreign direct investment is generally more stable, although neither its timing nor its volume is guaranteed.

Relative inflation, productivity, fiscal credibility and expectations also matter. Persistently higher domestic inflation can erode competitiveness and contribute to longer-run depreciation pressure. Expectations of future depreciation may induce importers to advance dollar purchases and exporters to postpone conversion of receipts, amplifying short-run pressure. No single variable reliably explains every exchange-rate movement.

3. Effects on trade, prices, borrowers and households

Depreciation can make domestic exports cheaper to foreign buyers if exporters reduce foreign-currency prices. Alternatively, exporters may keep those prices unchanged and receive more rupees per dollar, improving margins. Export volumes rise only if overseas demand responds and producers can expand supply. Imported machinery, components and energy may become costlier, offsetting part of the competitive gain.

Imports become more expensive in domestic currency, encouraging substitution where alternatives exist. However, demand for essential imports such as crude oil may be relatively price-inelastic in the short run. The import bill can therefore rise before import volumes adjust. Under standard assumptions, the Marshall–Lerner condition states that depreciation improves the trade balance when the sum of the absolute price elasticities of export and import demand exceeds one.

The J-curve describes a possible initial deterioration followed by improvement in the trade balance. Existing contracts and slow quantity adjustments allow higher import prices to dominate initially; export expansion and import substitution may emerge later. This is a conditional pattern, not an inevitable outcome. Invoicing practices, supply constraints and global demand can alter the response.

Costlier imported fuel, fertilisers and intermediate goods can generate imported inflation. Exchange-rate pass-through is often incomplete because firms adjust margins and governments may change taxes, subsidies or administered prices. Depreciation can complicate inflation control, although monetary tightening to counter it may also restrain domestic demand and investment.

• Unhedged foreign-currency borrowers face higher rupee costs of interest and principal repayments.
• Recipients of a fixed dollar remittance receive more rupees; overseas education and foreign travel become costlier.
• Exporters earning foreign currency may possess a natural hedge against foreign-currency liabilities.
• The net effect on a firm depends on its foreign-currency revenues, costs, debt and financial hedges.

4. Nominal depreciation versus real competitiveness

A bilateral exchange rate compares two currencies. The nominal effective exchange rate, or NEER, summarises movements against a weighted basket of trading-partner currencies. The real effective exchange rate, or REER, adjusts an effective nominal rate for relative prices. RBI publishes effective exchange-rate indices to help assess the rupee’s broader external value.

For RBI’s indices, an increase indicates appreciation and a decline indicates depreciation. This direction differs from a rupees-per-dollar quotation, where an increase indicates rupee depreciation. Always examine the quotation and index convention before interpreting a numerical movement.

A rupee fall against the dollar need not mean improved competitiveness against all trading partners. Other currencies may fall even more against the dollar. Similarly, higher inflation in India than abroad can offset nominal depreciation, producing real appreciation. REER is useful but not a complete measure of competitiveness: productivity, infrastructure, product quality, logistics and trade restrictions also affect export performance. An index above 100 indicates appreciation relative to its base period, not automatic proof of overvaluation.

5. India’s exchange-rate management and policy choices

India’s exchange rate is market-determined, but the RBI intervenes to contain excessive volatility and maintain orderly market conditions rather than defend a publicly announced fixed rate. Selling dollars and buying rupees can moderate depreciation pressure. Such sales also absorb rupee liquidity unless offset through other operations. Intervention can involve spot and forward markets.

Foreign-exchange reserves provide a buffer, not unlimited protection against sustained external pressure. Reserve changes also reflect valuation effects and other transactions; a fall in reported reserves should not automatically be equated with dollar sales. The RBI can offset intervention-related liquidity effects through sterilisation, using domestic monetary operations.

Policy responses must address causes rather than treat every depreciation as a crisis. Orderly adjustment can help absorb an external shock. Abrupt depreciation, however, can unsettle expectations, raise inflation and expose currency mismatches. A balanced strategy combines credible inflation management, adequate reserves, prudent external borrowing, hedging and measures to strengthen export capacity. Artificially defending an unsustainable rate can exhaust reserves, while allowing disorderly movements can damage financial stability.

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