Central banks play a pivotal role in shaping the foreign exchange (Forex) market, with their actions having significant economic consequences that can drive volatility in global exchange rates.
While they don’t directly set exchange rates—determined by market forces of supply and demand—central banks exert considerable influence over them through their monetary policies and interventions.
What is a Central Bank and What Does It Do?
A central bank is an independent public institution tasked with ensuring economic and financial stability within an economy. While most central banks focus on individual countries, some, like the European Central Bank (ECB), oversee multiple nations—in the ECB’s case, 20 of the 27 European Union countries have adopted the euro.
Central banks’ primary functions include maintaining price stability, which involves controlling inflation within a target range, fostering steady economic growth, and achieving full employment. They accomplish this by adjusting key interest rates and using monetary policy tools such as buying and selling government securities to influence borrowing costs. Additionally, central banks regulate financial institutions, monitor national payment systems, and provide liquidity to commercial banks when necessary.
Major Central Banks
The following are some of the most influential central banks:
- US Federal Reserve (Fed): The most impactful central bank, with a global reach.
- European Central Bank (ECB)
- Bank of England (BoE)
- Reserve Bank of Australia (RBA)
- Swiss National Bank (SNB)
- Bank of Japan (BoJ)
How Central Banks Affect the Forex Market
Interest Rates
One of the most direct ways central banks influence the Forex market is through adjustments in interest rates. A central bank unexpectedly raises or lowers interest rates can trigger significant market reactions. For instance, when the Swiss National Bank lowered its policy rate by a quarter of a percentage point in March 2024, the Swiss franc immediately dropped against major currencies. Generally, lowering interest rates reduces foreign investment due to lower yields, leading to a weaker currency. Conversely, higher interest rates can attract more foreign investment, increasing demand for the currency and driving its value up.
Expectations about future rate changes can also move the Forex market. For example, suppose the US Federal Reserve hints that it may raise interest rates due to rising inflation. In that case, traders may start buying US dollars in anticipation of higher returns, even before the actual rate hike takes place.
Open Market Operations
Open market operations (OMOs) involve the buying and selling of government securities to influence the money supply. When a central bank buys securities, it injects money into the banking system, increasing the money supply and encouraging lending. Selling securities has the opposite effect, tightening the money supply. These actions impact bond prices and yields, influencing currency values.
In cases where OMOs fail to achieve desired results, central banks may resort to quantitative easing (QE), a strategy involving purchasing longer-term securities to lower interest rates and stimulate the economy.
Many central banks are now unwinding these policies through quantitative tightening (QT), which involves selling the bonds they had previously bought. Both QE and QT can substantially affect currency values, depending on how they impact interest rates and the broader economy.
Central Bank Interventions
Central banks sometimes intervene directly in the Forex market to stabilize their currency’s value. They do this by buying or selling their currency using their reserves, aiming to smooth out extreme exchange rate fluctuations.
One form of intervention is verbal intervention, or “jawboning,” where central banks signal potential actions to influence the market. For example, if a central bank hints at future interventions, traders may adjust their positions, causing the currency to move without the bank taking any action.
A recent example of potential intervention comes from the Bank of Japan, which has hinted at supporting the Japanese yen (JPY) after it hit multi-decade lows against the US dollar. While the Bank has yet to intervene directly, its statements have influenced the USD/JPY exchange rate.
Currency Pegging
Some central banks choose to peg their currency to another, typically the US dollar, to enhance stability and reduce exchange rate risk. More than 60 countries peg their currencies to the dollar in what’s known as a Dollar Peg. Pegging can help stabilize a nation’s economy, particularly if it relies heavily on trade with the country to which it pegs its currency.
There are two primary types of pegs:
- Hard Peg: A fixed exchange rate where the currency remains constant against another.
- Soft Peg: A more flexible system where the currency fluctuates within a set range, with the central bank intervening to maintain that band.
Currency pegs don’t last forever. In 2015, the Swiss National Bank famously scrapped its peg to the euro, set at 1.20 Swiss francs per euro. The announcement caused the Swiss franc to surge by about 30% quickly, showing how dramatically markets can react when a peg is abandoned.
Conclusion
Central banks play a crucial role in the Forex market by influencing interest rates, conducting open market operations, and occasionally intervening directly. Their actions can cause significant fluctuations in currency values, making them key players for Forex traders to watch. Whether through changes in interest rates, adjustments in monetary policy, or interventions in the market, central banks have a profound and lasting impact on global exchange rates.
