Browse Economics

Adjustable Peg: Exchange Rate System

An exchange rate system where countries stabilize their exchange rates around par values that they retain the right to change, commonly used under the Bretton Woods system in the 1950s and 1960s.

Definition

An Adjustable Peg is an exchange rate system where countries stabilize their exchange rates around par values that they retain the right to change. Under this system, a country undertakes to intervene in the foreign exchange market to keep its currency within some margin, for example, 1 percent, of some given exchange rate parity, known as the “peg”. The country retains the right to adjust the parity, i.e., to move the peg. This system was prevalent under the Bretton Woods system in the 1950s and 1960s.

Types/Categories of Exchange Rate Systems

  1. Fixed Exchange Rate System: Currencies are pegged to a single currency or a basket of currencies.
  2. Floating Exchange Rate System: Exchange rates are determined by market forces without direct government or central bank intervention.
  3. Adjustable Peg System: Currencies are pegged to a value but can be adjusted under certain conditions.
  4. Crawling Peg: A system of small frequent exchange rate changes to achieve a desired policy objective.

Detailed Explanation

The adjustable peg system requires countries to intervene in the foreign exchange market to maintain their currency within a specified margin around the peg. Central banks play a critical role, as they must buy or sell their currency to defend the peg. Speculation can significantly impact the ability of a central bank to maintain its peg, potentially leading to costly interventions.

Basic Pegging Mechanism

$$ E_t = E_0 (1 + \delta) $$
Where:

  • \( E_t \) = Current exchange rate
  • \( E_0 \) = Initial pegged exchange rate
  • \( \delta \) = Allowed deviation from the peg (e.g., ±1%)

Importance

The adjustable peg system provides a level of stability while allowing flexibility to adjust to economic conditions. It is particularly useful during periods of economic uncertainty, as it offers a balance between the stability of fixed rates and the adaptability of floating rates.

Applicability

Applicable in international trade and finance, central bank policy-making, and economic stabilization efforts.

  • Fixed Exchange Rate: A system where the value of a currency is tied to another currency or a basket of currencies.
  • Floating Exchange Rate: A system where the value of a currency is determined by market forces.
  • Speculative Attack: Large-scale selling or buying of a currency, anticipating a change in the exchange rate.

FAQs

Q: Why was the adjustable peg system important under the Bretton Woods system? A: It allowed countries to stabilize their currencies while retaining the flexibility to adjust exchange rates in response to fundamental economic changes.

Q: What are the main challenges of maintaining an adjustable peg? A: The main challenges include the financial costs of intervention and the risks of speculative attacks.

Revised on Monday, May 18, 2026