What it means
The point of a fixed rate is predictability. Exporters, importers and foreign investors know exactly what a contract will be worth in their own currency, which lowers the cost of trade and makes long-term planning easier for businesses on both sides.
The mechanism is straightforward but expensive. If people are selling the local currency, the central bank buys it using its foreign reserves, and if the currency is under upward pressure it does the reverse, so the policy only works while the reserves and the political will last.
The price of a fixed rate is monetary independence. A country that pegs its currency largely imports the interest rate policy of the country it pegs to, which can mean tightening into a domestic slowdown simply to defend the rate.
There are several degrees of fixing. A hard peg or currency board holds a single unchanging rate, a crawling peg adjusts on a schedule, and a managed float lets the rate move within a band that the authorities defend at the edges.
The classic failure mode is a peg that no longer reflects economic reality. If domestic inflation runs well above that of the anchor country, the real value of the currency drifts upwards, exports become uncompetitive, and speculators eventually test whether the reserves can hold the line.
For businesses, a peg is a source of comfort and a source of hidden risk at the same time. Trading under a stable rate for years encourages companies to stop hedging, which is precisely why a sudden devaluation causes such damage when it comes.
In practice
Real-world examples.
Example
A furniture importer in a pegged-currency country signs three-year supply contracts priced in dollars and stops hedging, because the rate has not moved in a decade. When the peg is widened by 15%, its landed costs jump overnight and it has no cover in place.
Example
A tourism board benefits from a peg to a major currency because visitors can budget precisely and tour operators can publish prices a year in advance. The trade-off is that the country cannot cheapen itself against competing destinations when demand falls.
Example
A central bank defending a peg raises its policy rate from 4% to 9% to make holding the local currency attractive. Domestic manufacturers with floating-rate debt see their interest costs more than double at the worst possible moment.
Think of it
“Fixed rate means the exchange rate doesn't float-it's set and maintained by policy.
Formula
Calculation
Under a peg, conversion is simply arithmetic at the official rate:
Local currency amount = Foreign currency amount x Pegged rate
Suppose a country pegs its currency, the peso, at 5.00 pesos per $1. An importer orders components worth $50,000 from an overseas supplier.
Cost in local currency = $50,000 x 5.00 = 250,000 pesos
Now suppose sustained pressure forces the authorities to reset the peg to 6.25 pesos per $1, a devaluation of the local currency. The same order now costs:
New cost = $50,000 x 6.25 = 312,500 pesos
The increase is 312,500 - 250,000 = 62,500 pesos, which is 62,500 / 250,000 = 25% more for identical goods. The defence of the old rate is equally concrete: to buy back 1,000,000,000 pesos at 5.00, the central bank must sell 1,000,000,000 / 5.00 = $200,000,000 of its reserves, and a country holding $4,000,000,000 of reserves could repeat that intervention twenty times before running out.Case study
Seen in the real world.
The following country and companies are fictional and the scenario is purely illustrative. The Republic of Verano pegged its currency at 5.00 verans per $1 for eleven years, and the stability attracted a wave of foreign manufacturing investment. Domestic inflation, however, averaged around 7% a year while the anchor country's ran near 2%, so local costs slowly rose against the world.
Exports weakened, the trade deficit widened, and reserves fell from $9,000,000,000 to $2,000,000,000 over three years as the central bank bought verans to hold the line. When a large exporter announced redundancies, currency traders concluded the peg was no longer credible and pressure became overwhelming within weeks.
The authorities moved to a managed float and the currency settled near 6.25 verans per $1. Cordera Appliances, a fictional importer that had abandoned hedging years earlier, saw its input costs rise 25% at a stroke, while Verano Textiles, a fictional exporter, recovered competitiveness within two quarters. The illustrative lesson is that a peg does not remove currency risk; it stores it up and releases it all at once.
Watch out
Common mistakes.
- Believing a fixed rate means no currency risk, when it actually concentrates the risk into a single large move rather than spreading it over time.
- Assuming a peg is permanent because it has held for years, when the length of a peg says little about the reserves and policy discipline still behind it.
- Confusing a fixed rate with a stable economy, when defending an overvalued peg often forces painful interest rate rises and weak growth.
Questions
People also ask.
Who actually maintains a fixed exchange rate?
The central bank, using its foreign currency reserves and its policy interest rate to offset market pressure in either direction.
What is the difference between devaluation and depreciation?
Devaluation is a deliberate official reset of a fixed rate, while depreciation is a market-driven fall in a floating currency.
Should a business still hedge under a peg?
Yes, if the exposure is large or long-dated, because the cost of forward cover is usually small compared with the loss from a single unexpected repegging.
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