Fixed Exchange Rate
Like taping a price tag so it never changes, it's a government promise to lock its currency's exchange rate to another country's money.
Definition Just like an arcade token always exchanges for exactly $1, a fixed exchange rate is a system where a government or central bank locks its currency's value to a specific foreign currency (usually the US dollar). Instead of letting market supply and demand swing the exchange rate around, the government steps in to keep it anchored at a set price.
Taping Down the Price Tag on Currency
When exchange rates fluctuate every day, doing business internationally feels like a rollercoaster. If $1 is worth 1,000 local currency units today but spikes to 1,500 tomorrow, a factory importing raw materials from abroad could suffer massive overnight losses.
A fixed exchange rate system prevents this chaos by locking the exchange rate to a specific number. The government declares, "From now on, $1 will always exchange for exactly 1,000 of our currency," and strictly enforces that promise.
When exchange rates are frozen in place, global traders and investors can plan their future costs with confidence. Much like shopping in a store with fixed prices rather than haggling, cross-border business becomes far more stable and predictable.
The Cost of Defending the Peg
In a free market, prices rise when buyers flood in and fall when sellers rush out. The foreign exchange market is no differentโif everyone suddenly wants US dollars, the dollar's value naturally wants to soar.
To keep its promise, the government must jump directly into the market. If surging demand threatens to push up the dollar, the central bank sells its own stockpile of dollars to suppress the price. If dollars flood the market, it buys them up using its local currency.
This means that to sustain a fixed rate, a country must always maintain ample foreign exchange reserves. If foreign investors pull their money out all at once and the government runs out of dollar reserves, defending the peg failsโtriggering a severe currency crisis.
A Closer Look: You Can't Have It All
In economics, there is a famous principle known as the 'Impossible Trinity' (or the Trilemma). It states that a country can pick only two of three goals at the same time: free capital movement, independent monetary policy (controlling interest rates), and a fixed exchange rate.
If a country allows money to move freely across its borders and chooses a fixed exchange rate, it effectively gives up control over its own interest rates. Imagine the US hikes interest rates aggressively to fight inflation. What happens if our country keeps interest rates low to support a sluggish domestic economy?
Money would flood out of the country chasing higher US yields, putting intense downward pressure on the local currency. To defend the fixed rate, the central bank has no choice but to hike interest rates in tandem with the US, even if the domestic economy is struggling. In exchange for currency stability, the country sacrifices the freedom to steer its own monetary policy.
๐ค Common misconceptions
Under a fixed exchange rate, the government can just set the rate and do nothing.
To keep an exchange rate locked, the central bank must constantly intervene by buying or selling foreign currency. Left alone, natural market supply and demand would cause the rate to fluctuate.
๐งบ Where you meet it
A fixed exchange rate removes currency volatility for businesses, but maintaining it requires massive foreign exchange reserves and giving up control over domestic interest rates.