Adjustable Peg
Quick Answer
An adjustable peg is an exchange-rate arrangement in which a currency is kept at or near a specified value against another currency or reference, but that value can be changed under certain conditions. It sits between a permanently fixed exchange rate and a freely floating currency system.
How does an adjustable peg work?
Under an adjustable peg, monetary authorities establish a target or central exchange rate for the domestic currency relative to another currency, a basket of currencies, or another reference.
The authorities then seek to maintain the exchange rate around that level. Depending on the regime, this may involve monetary policy, foreign-exchange intervention or other policy measures.
The important feature is that the peg is not necessarily permanent. If economic conditions change sufficiently, authorities may formally reset, or realign, the pegged rate. IMF material describes the historical par-value system as a form of managed exchange-rate flexibility in which the peg could be changed under specified conditions.
A change that lowers the currency's official value relative to the reference currency is generally described as a devaluation under a fixed or pegged regime, while an upward adjustment is generally called a revaluation.
Key features of an adjustable peg
Several characteristics distinguish an adjustable peg from other exchange-rate systems:
A target exchange rate is maintained: The domestic currency is linked to another currency, basket or reference rather than being left entirely to market forces.
The peg can be changed: Authorities retain the ability to adjust the official rate when economic conditions justify a realignment.
It is an intermediate regime: An adjustable peg combines elements of exchange-rate stability with some capacity for discrete changes. IMF literature places fixed-but-adjustable systems between firmly fixed and more flexible exchange-rate arrangements.
Monetary policy may be constrained: Maintaining a peg can require monetary policy to support the exchange-rate objective, reducing the freedom to pursue other domestic goals independently.
Realignments may be disruptive: A sudden change in the peg can affect inflation, import prices, balance sheets and market expectations.
Simple adjustable peg example
Suppose Country A maintains its currency at:
10 units of Currency A = USD 1
Authorities seek to keep the exchange rate close to this level.
After a significant change in economic conditions, they decide that the existing rate is no longer sustainable and reset the peg to:
12 units of Currency A = USD 1
The domestic currency has therefore been devalued against the US dollar: more units of Currency A are now required to buy one dollar.
For example:
Before the adjustment:
USD 100 × 10 = 1,000 units of Currency A
After the adjustment:
USD 100 × 12 = 1,200 units of Currency A
This example is illustrative only. Actual exchange-rate regimes, intervention policies and realignments depend on the authorities and economic circumstances involved.
Potential benefits and uses
An adjustable peg may be intended to provide more exchange-rate stability than a freely floating currency while retaining some flexibility to respond to major economic changes.
Depending on the circumstances, it may:
provide a relatively stable reference for international trade and pricing;
help reduce short-term exchange-rate fluctuations;
serve as a monetary-policy anchor;
allow authorities to change the exchange rate when the existing peg becomes inconsistent with economic conditions.
These potential uses do not mean that an adjustable peg is suitable for every economy. The appropriate exchange-rate regime depends on factors such as economic structure, openness, inflation, capital flows and policy objectives.
Risks, limitations and common misconceptions
A common misconception is that an adjustable peg guarantees a stable exchange rate indefinitely. It does not. The defining feature of the arrangement is that authorities may change the peg when circumstances require it.
Maintaining a peg may also require substantial policy intervention and can limit monetary-policy independence, particularly where capital can move freely across borders. IMF analysis notes that pegged exchange rates can involve significant trade-offs between exchange-rate stability and independent monetary policy.
Another risk is that market participants may begin to expect a devaluation or revaluation. These expectations can place additional pressure on the currency and complicate efforts to maintain the existing peg. IMF research has specifically examined realignment expectations within adjustable-peg systems.
Historically, fixed-but-adjustable systems have also been vulnerable when economic fundamentals and the prevailing exchange rate diverge. IMF analysis has noted that such regimes can become difficult to sustain without appropriate policy conditions.