Dirty Floating: Managed Floating Exchange Rate

Introduction

Dirty floating, also known as a managed floating exchange rate system, refers to a currency exchange rate regime where the value of a country’s currency is allowed to fluctuate in the foreign exchange market. However, unlike a pure floating exchange rate, the government or central bank occasionally intervenes to stabilize or adjust the currency value to serve economic or political objectives.

Key Characteristics

1. Government Intervention: Central banks may buy or sell currencies to smooth out excessive volatility.
2. Market Determination: The currency value is largely determined by supply and demand forces in the foreign exchange market.
3. Policy Objectives: Interventions are typically driven by objectives such as controlling inflation, maintaining competitive export prices, or stabilizing the financial system.

Examples of Dirty Floating

1. India: The Reserve Bank of India occasionally intervenes in the forex market to maintain economic stability.
2. Brazil: The Central Bank of Brazil adjusts its currency operations to control inflation and ensure export competitiveness.

Mathematical Models

In a managed float system, central banks use various econometric models to decide on intervention. For example:

• Covered Interest Rate Parity (CIRP): Ensures that there is no arbitrage opportunity in the forex market.
  $$ \left(1 + i_{d} \right) = \frac{F}{S} \left( 1 + i_{f} \right) $$
  Where:
  • \( i_{d} \) = Domestic interest rate
  • \( i_{f} \) = Foreign interest rate
  • \( F \) = Forward exchange rate
  • \( S \) = Spot exchange rate

Importance

• Economic Stability: Dirty floating helps stabilize economies against shocks by allowing central banks to manage extreme volatility.
• Inflation Control: Central banks can mitigate inflation by managing currency strength.
• Export Competitiveness: By avoiding excessive currency appreciation, countries can keep their export goods competitively priced.

Related Terms

• Fixed Exchange Rate: A regime where the currency value is pegged to another major currency.
• Floating Exchange Rate: A regime where the currency value is determined purely by market forces without any intervention.
• Currency Peg: Fixing the exchange rate to another currency or basket of currencies.