South Korea’s latest interest rate hike was widely viewed as a response to stronger economic growth and rising inflation. But another objective received far less attention: defending the Korean won.
The won has weakened against the US dollar despite improving economic fundamentals, reflecting the continued strength of the greenback and shifting global capital flows. For the Bank of Korea, allowing the currency to depreciate too quickly risks importing inflation, undermining consumer purchasing power and reducing investor confidence.
South Korea is not alone.
Across Asia, central banks are increasingly focused on stabilising their currencies. While each economy faces different challenges, the underlying concern is similar: a stronger US dollar has made imports more expensive, increased inflationary pressures and complicated monetary policy decisions.
For investors, exchange rates are no longer merely a concern for multinational corporations or foreign exchange traders. Currency movements influence stock returns, bond performance, inflation, tourism, corporate earnings and portfolio diversification.
Understanding why central banks defend currencies has therefore become an essential part of investing in Asia.
Why Currencies Matter More Than Many Investors Realise
Exchange rates determine how much one currency is worth relative to another.
For consumers, this affects overseas travel, imported goods and international education costs.
For businesses, currency fluctuations influence export competitiveness, profit margins and supply-chain expenses.
For investors, exchange rates can either amplify or reduce investment returns.
Consider a Singapore investor who purchases shares in a South Korean company. Even if the stock price rises, gains could be offset if the Korean won weakens significantly against the Singapore dollar.
Conversely, a strengthening foreign currency can enhance returns even when underlying share prices remain relatively stable.
Currency movements therefore represent an often-overlooked source of investment risk and opportunity.
Why Central Banks Defend Their Currencies
A weakening currency is not always undesirable.
For export-oriented economies, depreciation can make locally produced goods more competitive in overseas markets.
However, excessive or rapid depreciation creates broader economic problems.
Imported Inflation
Many Asian economies rely heavily on imported energy, food and industrial raw materials.
When local currencies weaken, imports become more expensive, pushing up consumer prices.
This is particularly significant for countries that import oil and natural gas.
Capital Flight
Large currency declines may encourage investors to move capital into stronger currencies or markets offering higher returns.
Such outflows can increase financial market volatility and reduce liquidity.
Financial Stability
Businesses with US dollar-denominated debt face higher repayment costs when domestic currencies weaken.
This can strain corporate balance sheets, particularly during periods of slowing economic growth.
The Strong US Dollar Has Changed the Equation
Much of today’s currency pressure originates outside Asia.
The US dollar has remained relatively strong as the Federal Reserve maintained higher interest rates for longer than many investors expected.
Higher US yields attract global capital, increasing demand for dollar-denominated assets while reducing demand for emerging market currencies.
Even fundamentally healthy Asian economies have experienced depreciation against the greenback.
This creates a difficult balancing act for policymakers.
Raise interest rates too aggressively and domestic growth may weaken.
Do too little and inflation and currency weakness may worsen.
Different Countries, Different Strategies
Asian central banks have adopted different approaches depending on their economic structures.
South Korea
The Bank of Korea has combined higher interest rates with clear policy communication to stabilise expectations.
Japan
The Bank of Japan has gradually normalised monetary policy after decades of exceptionally low interest rates, while also monitoring excessive yen volatility.
China
The People’s Bank of China relies on a combination of monetary policy, capital controls and daily reference rates to manage the yuan.
Singapore
Singapore stands apart.
Rather than targeting domestic interest rates, the Monetary Authority of Singapore manages monetary policy primarily through the Singapore dollar’s exchange rate.
This framework allows MAS to control imported inflation by permitting the Singapore dollar to appreciate gradually within a managed policy band.
As a result, Singapore has historically experienced lower imported inflation than many regional economies.
What It Means for Singapore Investors
Currency movements increasingly influence investment decisions.
Overseas Investments
Investors holding foreign equities should consider both share-price performance and exchange-rate movements.
Ignoring currency exposure may lead to unexpected gains—or losses.
Fixed Income
Foreign bond investments carry currency risk in addition to interest-rate risk.
Hedged and unhedged bond strategies may perform differently depending on exchange-rate trends.
Regional Equities
Companies with significant overseas earnings may benefit from favourable exchange-rate movements.
Conversely, firms heavily dependent on imported inputs may experience margin pressure.
Businesses Face New Currency Challenges
Corporate treasurers have become increasingly active in managing foreign exchange exposure.
Many companies now use financial instruments such as forward contracts and options to reduce currency volatility.
Exporters often benefit from weaker domestic currencies, while importers generally prefer currency stability.
For multinational businesses operating across Asia, currency management has become an increasingly important component of financial strategy.
Could Asia Face Another Currency Crisis?
Comparisons with the 1997 Asian Financial Crisis occasionally resurface whenever currencies weaken sharply.
Today’s environment, however, differs substantially.
Most Asian economies now maintain:
- Larger foreign exchange reserves.
- More flexible exchange-rate regimes.
- Stronger banking systems.
- Better capital regulation.
- Lower levels of foreign currency debt.
While currency volatility remains a risk, the probability of a region-wide financial crisis appears considerably lower than it was nearly three decades ago.
How Investors Can Manage Currency Risk
Investors cannot predict exchange rates consistently.
Instead, they should manage exposure prudently.
Potential approaches include:
- Diversifying geographically.
- Holding assets denominated in multiple currencies.
- Considering currency-hedged investment funds.
- Reviewing foreign exchange exposure within portfolios.
- Focusing on long-term investment objectives rather than short-term currency fluctuations.
Currency diversification can reduce portfolio volatility without requiring investors to speculate directly on foreign exchange markets.
The Bigger Picture
South Korea’s recent interest rate increase highlights an important reality: monetary policy today is about far more than inflation.
Central banks are also managing currencies, investor confidence and financial stability in an increasingly interconnected global economy.
For Singapore investors, understanding exchange rates is becoming just as important as analysing corporate earnings or economic growth.
Currency movements affect almost every internationally diversified portfolio, influencing returns in subtle but meaningful ways.
As Asia navigates a period of higher interest rates, geopolitical uncertainty and shifting global capital flows, exchange rates are likely to remain one of the defining investment themes of the coming years.