Meaning and Purpose
Foreign exchange market intervention refers to action by a country’s central bank or monetary authority to influence the value or volatility of its currency in the foreign-exchange market.
In India, such intervention is undertaken by the Reserve Bank of India.
The RBI does not officially target a fixed exchange rate. Instead, it generally seeks to:
- reduce excessive volatility;
- prevent disorderly market conditions;
- smooth sharp currency movements;
- maintain confidence in the foreign-exchange market;
- preserve adequate foreign-exchange reserves.
Intervention may involve buying or selling foreign currency, mainly US dollars.
How Intervention Works
When the domestic currency is depreciating sharply
The central bank may sell US dollars and buy domestic currency.
This increases the supply of dollars and demand for the domestic currency, helping moderate depreciation.
When the domestic currency is appreciating sharply
The central bank may buy US dollars and sell domestic currency.
This increases demand for dollars and can moderate appreciation.
The basic mechanism is:
Central bank sells dollars → Domestic currency supported
Central bank buys dollars → Domestic currency appreciation moderated
Intervention may occur in the spot market, forward market or through other foreign-exchange instruments.
Sterilised and Unsterilised Intervention
Foreign-exchange intervention can affect domestic liquidity.
If the central bank buys foreign currency, it normally injects domestic currency into the banking system. If it sells foreign currency, domestic liquidity is withdrawn.
Unsterilised intervention
The central bank allows this liquidity effect to remain.
This can influence:
- money supply;
- interest rates;
- inflation;
- domestic credit conditions.
Sterilised intervention
The central bank takes additional monetary action to offset the liquidity impact.
For example, if dollar purchases inject excess rupee liquidity, the RBI may absorb that liquidity through:
- open-market operations;
- liquidity-management instruments;
- government securities transactions.
Sterilisation allows the central bank to influence the exchange rate without significantly altering domestic monetary conditions.
Importance for India
India follows a market-determined exchange-rate system, but the RBI intervenes when movements become excessively volatile.
Foreign-exchange intervention can help:
- contain panic-driven currency depreciation;
- reduce imported inflation;
- stabilise financial markets;
- protect firms with foreign-currency liabilities;
- maintain confidence among foreign investors;
- prevent sudden disruption in trade and capital flows.
However, excessive intervention may create problems.
Persistent defence of a particular exchange rate can:
- deplete foreign-exchange reserves;
- distort market signals;
- create expectations of central-bank support;
- conflict with domestic monetary-policy objectives.
Similarly, repeated purchases of foreign currency can increase domestic liquidity and inflationary pressure unless sterilised.
Limitations and Policy Considerations
Foreign-exchange intervention is most effective when currency movements are driven by temporary volatility rather than long-term economic fundamentals.
Persistent depreciation caused by:
- high inflation;
- weak productivity;
- large external deficits;
- capital outflows;
- political or financial instability
cannot be permanently reversed through reserve sales alone.
A sustainable exchange-rate framework therefore requires:
- sound macroeconomic fundamentals;
- adequate foreign-exchange reserves;
- credible monetary policy;
- manageable current-account deficits;
- stable capital flows;
- deep foreign-exchange markets.
Intervention should therefore smooth excessive fluctuations rather than permanently resist justified changes in the currency’s market value.
Conclusion
Foreign exchange market intervention is an important tool for maintaining orderly currency markets. In India, the RBI uses it primarily to reduce excessive volatility rather than maintain a fixed rupee value, while balancing reserve adequacy, inflation, liquidity and broader monetary-policy objectives.
